216855372 has 48 divisors (see below), whose sum is σ = 521240832. Its totient is φ = 70119360.

The previous prime is 216855367. The next prime is 216855389. The reversal of 216855372 is 273558612.

It is a self number, because there is not a number n which added to its sum of digits gives 216855372.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222847 + ... + 223817.

It is an arithmetic number, because the mean of its divisors is an integer number (10859184).

Almost surely, 2^216855372 is an apocalyptic number.

It is an amenable number.

216855372 is an abundant number, since it is smaller than the sum of its proper divisors (304385460).

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

216855372 is a wasteful number, since it uses less digits than its factorization.

216855372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518 (or 1516 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 216855372 is about 14726.0100502478. The cubic root of 216855372 is about 600.7909679358.

The spelling of 216855372 in words is "two hundred sixteen million, eight hundred fifty-five thousand, three hundred seventy-two".