55920428 has 6 divisors (see below), whose sum is σ = 97860756. Its totient is φ = 27960212.

The previous prime is 55920427. The next prime is 55920437. The reversal of 55920428 is 82402955.

It is a happy number.

55920428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55920427) 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 as a sum of consecutive naturals, namely, 6990050 + ... + 6990057.

It is an arithmetic number, because the mean of its divisors is an integer number (16310126).

Almost surely, 2^55920428 is an apocalyptic number.

It is an amenable number.

55920428 is a deficient number, since it is larger than the sum of its proper divisors (41940328).

55920428 is a wasteful number, since it uses less digits than its factorization.

55920428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13980111 (or 13980109 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 55920428 is about 7477.9962556824. The cubic root of 55920428 is about 382.4049414200.

The spelling of 55920428 in words is "fifty-five million, nine hundred twenty thousand, four hundred twenty-eight".