55977564 has 24 divisors (see below), whose sum is σ = 133394688. Its totient is φ = 18262000.

The previous prime is 55977563. The next prime is 55977613. The reversal of 55977564 is 46577955.

55977564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55977563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49062 + ... + 50189.

It is an arithmetic number, because the mean of its divisors is an integer number (5558112).

Almost surely, 2^55977564 is an apocalyptic number.

It is an amenable number.

55977564 is an abundant number, since it is smaller than the sum of its proper divisors (77417124).

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

55977564 is a wasteful number, since it uses less digits than its factorization.

55977564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99305 (or 99303 counting only the distinct ones).

The product of its digits is 1323000, while the sum is 48.

The square root of 55977564 is about 7481.8155550642. The cubic root of 55977564 is about 382.5351362486.

The spelling of 55977564 in words is "fifty-five million, nine hundred seventy-seven thousand, five hundred sixty-four".