55238920 has 96 divisors (see below), whose sum is σ = 139187160. Its totient is φ = 19712000.

The previous prime is 55238917. The next prime is 55238983. The reversal of 55238920 is 2983255.

It can be written as a sum of positive squares in 4 ways, for example, as 42693156 + 12545764 = 6534^2 + 3542^2 .

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, 488784 + ... + 488896.

Almost surely, 2^55238920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55238920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69593580).

55238920 is an abundant number, since it is smaller than the sum of its proper divisors (83948240).

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

55238920 is a wasteful number, since it uses less digits than its factorization.

55238920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 55238920 is about 7432.2890148325. The cubic root of 55238920 is about 380.8451181446.

The spelling of 55238920 in words is "fifty-five million, two hundred thirty-eight thousand, nine hundred twenty".