55640858 has 16 divisors (see below), whose sum is σ = 102721920. Its totient is φ = 22011696.

The previous prime is 55640857. The next prime is 55640863. The reversal of 55640858 is 85804655.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55640857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152678 + ... + 153041.

It is an arithmetic number, because the mean of its divisors is an integer number (6420120).

Almost surely, 2^55640858 is an apocalyptic number.

55640858 is a deficient number, since it is larger than the sum of its proper divisors (47081062).

55640858 is a wasteful number, since it uses less digits than its factorization.

55640858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305741.

The product of its (nonzero) digits is 192000, while the sum is 41.

The square root of 55640858 is about 7459.2799920636. The cubic root of 55640858 is about 381.7666081615.

It can be divided in two parts, 556 and 40858, that added together give a palindrome (41414).

The spelling of 55640858 in words is "fifty-five million, six hundred forty thousand, eight hundred fifty-eight".