55305590 has 32 divisors (see below), whose sum is σ = 106375680. Its totient is φ = 20629504.

The previous prime is 55305587. The next prime is 55305647. The reversal of 55305590 is 9550355.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17771 + ... + 20649.

It is an arithmetic number, because the mean of its divisors is an integer number (3324240).

Almost surely, 2^55305590 is an apocalyptic number.

55305590 is a deficient number, since it is larger than the sum of its proper divisors (51070090).

55305590 is a wasteful number, since it uses less digits than its factorization.

55305590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016.

The product of its (nonzero) digits is 16875, while the sum is 32.

The square root of 55305590 is about 7436.7728215941. The cubic root of 55305590 is about 380.9982754702.

The spelling of 55305590 in words is "fifty-five million, three hundred five thousand, five hundred ninety".