56478581 has 4 divisors (see below), whose sum is σ = 56746464. Its totient is φ = 56210700.

The previous prime is 56478563. The next prime is 56478629. The reversal of 56478581 is 18587465.

It is a happy number.

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 56478581 - 2²² = 52284277 is a prime.

It is a super-2 number, since 2×56478581² = 6379660223547122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56478481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133625 + ... + 134046.

It is an arithmetic number, because the mean of its divisors is an integer number (14186616).

Almost surely, 2^56478581 is an apocalyptic number.

It is an amenable number.

56478581 is a deficient number, since it is larger than the sum of its proper divisors (267883).

56478581 is a wasteful number, since it uses less digits than its factorization.

56478581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267882.

The product of its digits is 268800, while the sum is 44.

The square root of 56478581 is about 7515.2232834427. The cubic root of 56478581 is about 383.6730185428.

The spelling of 56478581 in words is "fifty-six million, four hundred seventy-eight thousand, five hundred eighty-one".