55372390 has 32 divisors (see below), whose sum is σ = 102871296. Its totient is φ = 21446880.

The previous prime is 55372367. The next prime is 55372391. The reversal of 55372390 is 9327355.

It is a super-2 number, since 2×55372390² = 6132203148624200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55372391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55839 + ... + 56821.

It is an arithmetic number, because the mean of its divisors is an integer number (3214728).

Almost surely, 2^55372390 is an apocalyptic number.

55372390 is a deficient number, since it is larger than the sum of its proper divisors (47498906).

55372390 is a wasteful number, since it uses less digits than its factorization.

55372390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 28350, while the sum is 34.

The square root of 55372390 is about 7441.2626616724. The cubic root of 55372390 is about 381.1516080413.

The spelling of 55372390 in words is "fifty-five million, three hundred seventy-two thousand, three hundred ninety".