55289857 has 4 divisors (see below), whose sum is σ = 63188416. Its totient is φ = 47391300.

The previous prime is 55289849. The next prime is 55289881. The reversal of 55289857 is 75898255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55289857 - 2³ = 55289849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55289857.

It is not an unprimeable number, because it can be changed into a prime (55289827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3949269 + ... + 3949282.

It is an arithmetic number, because the mean of its divisors is an integer number (15797104).

Almost surely, 2^55289857 is an apocalyptic number.

It is an amenable number.

55289857 is a deficient number, since it is larger than the sum of its proper divisors (7898559).

55289857 is an equidigital number, since it uses as much as digits as its factorization.

55289857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7898558.

The product of its digits is 1008000, while the sum is 49.

The square root of 55289857 is about 7435.7149622615. The cubic root of 55289857 is about 380.9621440149.

It can be divided in two parts, 552 and 89857, that added together give a palindrome (90409).

The spelling of 55289857 in words is "fifty-five million, two hundred eighty-nine thousand, eight hundred fifty-seven".