216278460 has 72 divisors (see below), whose sum is σ = 661280256. Its totient is φ = 57214080.

The previous prime is 216278459. The next prime is 216278521. The reversal of 216278460 is 64872612.

216278460 is a `hidden beast` number, since 21 + 627 + 8 + 4 + 6 + 0 = 666.

216278460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18130 + ... + 27590.

It is an arithmetic number, because the mean of its divisors is an integer number (9184448).

Almost surely, 2^216278460 is an apocalyptic number.

216278460 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 216278460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330640128).

216278460 is an abundant number, since it is smaller than the sum of its proper divisors (445001796).

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

216278460 is a wasteful number, since it uses less digits than its factorization.

216278460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9603 (or 9598 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 216278460 is about 14706.4088070474. The cubic root of 216278460 is about 600.2577226159.

The spelling of 216278460 in words is "two hundred sixteen million, two hundred seventy-eight thousand, four hundred sixty".