216280740 has 96 divisors (see below), whose sum is σ = 668174976. Its totient is φ = 51932160.

The previous prime is 216280733. The next prime is 216280747. The reversal of 216280740 is 47082612.

216280740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216280733) and next prime (216280747).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 216280698 and 216280707.

It is not an unprimeable number, because it can be changed into a prime (216280747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28599 + ... + 35361.

It is an arithmetic number, because the mean of its divisors is an integer number (6960156).

Almost surely, 2^216280740 is an apocalyptic number.

216280740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216280740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334087488).

216280740 is an abundant number, since it is smaller than the sum of its proper divisors (451894236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216280740 is a wasteful number, since it uses less digits than its factorization.

216280740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6829 (or 6827 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 216280740 is about 14706.4863240680. The cubic root of 216280740 is about 600.2598319072.

The spelling of 216280740 in words is "two hundred sixteen million, two hundred eighty thousand, seven hundred forty".