55640075 has 24 divisors (see below), whose sum is σ = 74422320. Its totient is φ = 41126400.

The previous prime is 55640069. The next prime is 55640093. The reversal of 55640075 is 57004655.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-55640075 is a prime.

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, 18047 + ... + 20903.

It is an arithmetic number, because the mean of its divisors is an integer number (3100930).

Almost surely, 2^55640075 is an apocalyptic number.

55640075 is a deficient number, since it is larger than the sum of its proper divisors (18782245).

55640075 is a wasteful number, since it uses less digits than its factorization.

55640075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2927 (or 2922 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 55640075 is about 7459.2275069205. The cubic root of 55640075 is about 381.7648173633.

The spelling of 55640075 in words is "fifty-five million, six hundred forty thousand, seventy-five".