55561790 has 32 divisors (see below), whose sum is σ = 107196480. Its totient is φ = 20680704.

The previous prime is 55561787. The next prime is 55561837. The reversal of 55561790 is 9716555.

It is a super-2 number, since 2×55561790² = 6174225016008200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5246 + ... + 11774.

It is an arithmetic number, because the mean of its divisors is an integer number (3349890).

Almost surely, 2^55561790 is an apocalyptic number.

55561790 is a deficient number, since it is larger than the sum of its proper divisors (51634690).

55561790 is a wasteful number, since it uses less digits than its factorization.

55561790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6596.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 55561790 is about 7453.9781325142. The cubic root of 55561790 is about 381.5856869653.

The spelling of 55561790 in words is "fifty-five million, five hundred sixty-one thousand, seven hundred ninety".