55389380 has 24 divisors (see below), whose sum is σ = 116567640. Its totient is φ = 22108160.

The previous prime is 55389379. The next prime is 55389431. The reversal of 55389380 is 8398355.

It can be written as a sum of positive squares in 4 ways, for example, as 18130564 + 37258816 = 4258^2 + 6104^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7460 + ... + 12900.

It is an arithmetic number, because the mean of its divisors is an integer number (4856985).

Almost surely, 2^55389380 is an apocalyptic number.

It is an amenable number.

55389380 is an abundant number, since it is smaller than the sum of its proper divisors (61178260).

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

55389380 is a wasteful number, since it uses less digits than its factorization.

55389380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5959 (or 5957 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 55389380 is about 7442.4041814457. The cubic root of 55389380 is about 381.1905871764.

Subtracting from 55389380 its reverse (8398355), we obtain a square (46991025 = 6855²).

The spelling of 55389380 in words is "fifty-five million, three hundred eighty-nine thousand, three hundred eighty".