56219904 has 108 divisors (see below), whose sum is σ = 174657756. Its totient is φ = 17289216.

The previous prime is 56219903. The next prime is 56219921. The reversal of 56219904 is 40991265.

56219904 is a `hidden beast` number, since 562 + 1 + 9 + 90 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20793600 + 35426304 = 4560^2 + 5952^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (56219903) 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 11 ways as a sum of consecutive naturals, for example, 29014 + ... + 30890.

Almost surely, 2^56219904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56219904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87328878).

56219904 is an abundant number, since it is smaller than the sum of its proper divisors (118437852).

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

56219904 is a wasteful number, since it uses less digits than its factorization.

56219904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 56219904 is about 7497.9933315521. The cubic root of 56219904 is about 383.0863696395.

The spelling of 56219904 in words is "fifty-six million, two hundred nineteen thousand, nine hundred four".