56621388 has 12 divisors (see below), whose sum is σ = 132116600. Its totient is φ = 18873792.

The previous prime is 56621381. The next prime is 56621399. The reversal of 56621388 is 88312665.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (56621381) 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, 2359213 + ... + 2359236.

Almost surely, 2^56621388 is an apocalyptic number.

It is an amenable number.

56621388 is an abundant number, since it is smaller than the sum of its proper divisors (75495212).

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

56621388 is a wasteful number, since it uses less digits than its factorization.

56621388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718456 (or 4718454 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 56621388 is about 7524.7184664943. The cubic root of 56621388 is about 383.9961208375.

The spelling of 56621388 in words is "fifty-six million, six hundred twenty-one thousand, three hundred eighty-eight".