55709856 has 60 divisors (see below), whose sum is σ = 163848762. Its totient is φ = 18569088.

The previous prime is 55709839. The next prime is 55709861. The reversal of 55709856 is 65890755.

55709856 is a `hidden beast` number, since 557 + 0 + 98 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54464400 + 1245456 = 7380^2 + 1116^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8155 + ... + 13338.

Almost surely, 2^55709856 is an apocalyptic number.

It is an amenable number.

55709856 is an abundant number, since it is smaller than the sum of its proper divisors (108138906).

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

55709856 is a wasteful number, since it uses less digits than its factorization.

55709856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21515 (or 21498 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 55709856 is about 7463.9035363542. The cubic root of 55709856 is about 381.9243474720.

It can be divided in two parts, 55709 and 856, that added together give a palindrome (56565).

The spelling of 55709856 in words is "fifty-five million, seven hundred nine thousand, eight hundred fifty-six".