55581372 has 72 divisors (see below), whose sum is σ = 175174272. Its totient is φ = 14436000.

The previous prime is 55581349. The next prime is 55581467. The reversal of 55581372 is 27318555.

55581372 is a `hidden beast` number, since 5 + 5 + 581 + 3 + 72 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7254 + ... + 12797.

It is an arithmetic number, because the mean of its divisors is an integer number (2432976).

Almost surely, 2^55581372 is an apocalyptic number.

It is an amenable number.

55581372 is an abundant number, since it is smaller than the sum of its proper divisors (119592900).

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

55581372 is a wasteful number, since it uses less digits than its factorization.

55581372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20079 (or 20074 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 55581372 is about 7455.2915435951. The cubic root of 55581372 is about 381.6305099348.

The spelling of 55581372 in words is "fifty-five million, five hundred eighty-one thousand, three hundred seventy-two".