56788521 has 4 divisors (see below), whose sum is σ = 75718032. Its totient is φ = 37859012.

The previous prime is 56788507. The next prime is 56788531. The reversal of 56788521 is 12588765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56788521 - 2⁹ = 56788009 is a prime.

It is a super-2 number, since 2×56788521² = 6449872234734882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56788531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9464751 + ... + 9464756.

It is an arithmetic number, because the mean of its divisors is an integer number (18929508).

Almost surely, 2^56788521 is an apocalyptic number.

It is an amenable number.

56788521 is a deficient number, since it is larger than the sum of its proper divisors (18929511).

56788521 is a wasteful number, since it uses less digits than its factorization.

56788521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18929510.

The product of its digits is 134400, while the sum is 42.

The square root of 56788521 is about 7535.8158815088. The cubic root of 56788521 is about 384.3735717311.

The spelling of 56788521 in words is "fifty-six million, seven hundred eighty-eight thousand, five hundred twenty-one".