55157440 has 56 divisors (see below), whose sum is σ = 141457680. Its totient is φ = 20364288.

The previous prime is 55157411. The next prime is 55157521. The reversal of 55157440 is 4475155.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 2470 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (2526030).

Almost surely, 2^55157440 is an apocalyptic number.

It is an amenable number.

55157440 is an abundant number, since it is smaller than the sum of its proper divisors (86300240).

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

55157440 is a wasteful number, since it uses less digits than its factorization.

55157440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13289 (or 13279 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 55157440 is about 7426.8055043875. The cubic root of 55157440 is about 380.6577711903.

The spelling of 55157440 in words is "fifty-five million, one hundred fifty-seven thousand, four hundred forty".