216057240 has 128 divisors (see below), whose sum is σ = 823104000. Its totient is φ = 49382784.

The previous prime is 216057187. The next prime is 216057287. The reversal of 216057240 is 42750612.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6730 + ... + 21849.

It is an arithmetic number, because the mean of its divisors is an integer number (6430500).

Almost surely, 2^216057240 is an apocalyptic number.

216057240 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 216057240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411552000).

216057240 is an abundant number, since it is smaller than the sum of its proper divisors (607046760).

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

216057240 is a wasteful number, since it uses less digits than its factorization.

216057240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28606 (or 28596 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 216057240 is about 14698.8856720501. The cubic root of 216057240 is about 600.0529953190.

It can be divided in two parts, 2160572 and 40, that added together give a palindrome (2160612).

The spelling of 216057240 in words is "two hundred sixteen million, fifty-seven thousand, two hundred forty".