56217690 has 48 divisors (see below), whose sum is σ = 148363488. Its totient is φ = 14766048.

The previous prime is 56217677. The next prime is 56217701. The reversal of 56217690 is 9671265.

56217690 is a `hidden beast` number, since 562 + 1 + 7 + 6 + 90 = 666.

56217690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×56217690² = 6320857337872200, which contains 22 as substring.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 1369 + ... + 10691.

It is an arithmetic number, because the mean of its divisors is an integer number (3090906).

Almost surely, 2^56217690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56217690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74181744).

56217690 is an abundant number, since it is smaller than the sum of its proper divisors (92145798).

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

56217690 is a wasteful number, since it uses less digits than its factorization.

56217690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9403 (or 9400 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 56217690 is about 7497.8456905967. The cubic root of 56217690 is about 383.0813407897.

The spelling of 56217690 in words is "fifty-six million, two hundred seventeen thousand, six hundred ninety".