56578420 has 24 divisors (see below), whose sum is σ = 122913000. Its totient is φ = 21850752.

The previous prime is 56578393. The next prime is 56578427. The reversal of 56578420 is 2487565.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2232036 + 54346384 = 1494^2 + 7372^2 .

It is a super-2 number, since 2×56578420² = 6402235219392800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56578420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56578427) 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, 48195 + ... + 49354.

It is an arithmetic number, because the mean of its divisors is an integer number (5121375).

Almost surely, 2^56578420 is an apocalyptic number.

It is an amenable number.

56578420 is an abundant number, since it is smaller than the sum of its proper divisors (66334580).

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

56578420 is a wasteful number, since it uses less digits than its factorization.

56578420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97587 (or 97585 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 56578420 is about 7521.8628011949. The cubic root of 56578420 is about 383.8989624945.

The spelling of 56578420 in words is "fifty-six million, five hundred seventy-eight thousand, four hundred twenty".