56405578 has 4 divisors (see below), whose sum is σ = 84608370. Its totient is φ = 28202788.

The previous prime is 56405563. The next prime is 56405617. The reversal of 56405578 is 87550465.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87550465 = 5 ⋅17510093.

It can be written as a sum of positive squares in only one way, i.e., 46689889 + 9715689 = 6833^2 + 3117^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 56405578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14101393 + ... + 14101396.

Almost surely, 2^56405578 is an apocalyptic number.

56405578 is a deficient number, since it is larger than the sum of its proper divisors (28202792).

56405578 is a wasteful number, since it uses less digits than its factorization.

56405578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28202791.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 56405578 is about 7510.3647048595. The cubic root of 56405578 is about 383.5076381005.

The spelling of 56405578 in words is "fifty-six million, four hundred five thousand, five hundred seventy-eight".