55581790 has 32 divisors (see below), whose sum is σ = 109486080. Its totient is φ = 20148000.

The previous prime is 55581781. The next prime is 55581811. The reversal of 55581790 is 9718555.

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, 47715 + ... + 48865.

It is an arithmetic number, because the mean of its divisors is an integer number (3421440).

Almost surely, 2^55581790 is an apocalyptic number.

55581790 is a deficient number, since it is larger than the sum of its proper divisors (53904290).

55581790 is a wasteful number, since it uses less digits than its factorization.

55581790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 55581790 is about 7455.3195773220. The cubic root of 55581790 is about 381.6314666172.

The spelling of 55581790 in words is "fifty-five million, five hundred eighty-one thousand, seven hundred ninety".