56217520 has 40 divisors (see below), whose sum is σ = 136393056. Its totient is φ = 21508608.

The previous prime is 56217443. The next prime is 56217527. The reversal of 56217520 is 2571265.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (56217527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13437 + ... + 17116.

Almost surely, 2^56217520 is an apocalyptic number.

It is an amenable number.

56217520 is an abundant number, since it is smaller than the sum of its proper divisors (80175536).

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

56217520 is a wasteful number, since it uses less digits than its factorization.

56217520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30589 (or 30583 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 56217520 is about 7497.8343539985. The cubic root of 56217520 is about 383.0809546485.

Adding to 56217520 its reverse (2571265), we get a palindrome (58788785).

The spelling of 56217520 in words is "fifty-six million, two hundred seventeen thousand, five hundred twenty".