216572656 has 40 divisors (see below), whose sum is σ = 447319584. Its totient is φ = 101222400.

The previous prime is 216572627. The next prime is 216572687. The reversal of 216572656 is 656275612.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 38436 + ... + 43708.

Almost surely, 2^216572656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216572656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223659792).

216572656 is an abundant number, since it is smaller than the sum of its proper divisors (230746928).

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

216572656 is a wasteful number, since it uses less digits than its factorization.

216572656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5449 (or 5443 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 216572656 is about 14716.4077138410. The cubic root of 216572656 is about 600.5297691405.

The spelling of 216572656 in words is "two hundred sixteen million, five hundred seventy-two thousand, six hundred fifty-six".