55391472 has 40 divisors (see below), whose sum is σ = 158995280. Its totient is φ = 18463680.

The previous prime is 55391471. The next prime is 55391489. The reversal of 55391472 is 27419355.

55391472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55391471) 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, 63679 + ... + 64542.

It is an arithmetic number, because the mean of its divisors is an integer number (3974882).

Almost surely, 2^55391472 is an apocalyptic number.

It is an amenable number.

55391472 is an abundant number, since it is smaller than the sum of its proper divisors (103603808).

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

55391472 is a wasteful number, since it uses less digits than its factorization.

55391472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128238 (or 128226 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 55391472 is about 7442.5447261001. The cubic root of 55391472 is about 381.1953861750.

The spelling of 55391472 in words is "fifty-five million, three hundred ninety-one thousand, four hundred seventy-two".