56405577 has 4 divisors (see below), whose sum is σ = 75207440. Its totient is φ = 37603716.

The previous prime is 56405563. The next prime is 56405617. The reversal of 56405577 is 77550465.

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 not a de Polignac number, because 56405577 - 2⁴ = 56405561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56405527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9400927 + ... + 9400932.

It is an arithmetic number, because the mean of its divisors is an integer number (18801860).

Almost surely, 2^56405577 is an apocalyptic number.

It is an amenable number.

56405577 is a deficient number, since it is larger than the sum of its proper divisors (18801863).

56405577 is a wasteful number, since it uses less digits than its factorization.

56405577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18801862.

The product of its (nonzero) digits is 147000, while the sum is 39.

The square root of 56405577 is about 7510.3646382849. The cubic root of 56405577 is about 383.5076358341.

The spelling of 56405577 in words is "fifty-six million, four hundred five thousand, five hundred seventy-seven".