56217456 has 80 divisors (see below), whose sum is σ = 162489600. Its totient is φ = 18608832.

The previous prime is 56217443. The next prime is 56217527. The reversal of 56217456 is 65471265.

It is a happy number.

It is a super-2 number, since 2×56217456² = 6320804718223872, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 56217456.

It is a congruent number.

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, 76965 + ... + 77691.

It is an arithmetic number, because the mean of its divisors is an integer number (2031120).

Almost surely, 2^56217456 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 56217456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81244800).

56217456 is an abundant number, since it is smaller than the sum of its proper divisors (106272144).

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

56217456 is a wasteful number, since it uses less digits than its factorization.

56217456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 911 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 56217456 is about 7497.8300860982. The cubic root of 56217456 is about 383.0808092775.

The spelling of 56217456 in words is "fifty-six million, two hundred seventeen thousand, four hundred fifty-six".