55912820 has 24 divisors (see below), whose sum is σ = 123597600. Its totient is φ = 21187872.

The previous prime is 55912819. The next prime is 55912823. The reversal of 55912820 is 2821955.

55912820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×55912820³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55912823) 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, 73190 + ... + 73949.

It is an arithmetic number, because the mean of its divisors is an integer number (5149900).

Almost surely, 2^55912820 is an apocalyptic number.

It is an amenable number.

55912820 is an abundant number, since it is smaller than the sum of its proper divisors (67684780).

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

55912820 is a wasteful number, since it uses less digits than its factorization.

55912820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147167 (or 147165 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 55912820 is about 7477.4875459609. The cubic root of 55912820 is about 382.3875985106.

The spelling of 55912820 in words is "fifty-five million, nine hundred twelve thousand, eight hundred twenty".