55507690 has 32 divisors (see below), whose sum is σ = 116524800. Its totient is φ = 19030032.

The previous prime is 55507679. The next prime is 55507693. The reversal of 55507690 is 9670555.

It is a super-2 number, since 2×55507690² = 6162207298272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55507693) by changing a digit.

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, 4662 + ... + 11521.

It is an arithmetic number, because the mean of its divisors is an integer number (3641400).

Almost surely, 2^55507690 is an apocalyptic number.

55507690 is an abundant number, since it is smaller than the sum of its proper divisors (61017110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55507690 is a wasteful number, since it uses less digits than its factorization.

55507690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16211 (or 16197 counting only the distinct ones).

The product of its (nonzero) digits is 47250, while the sum is 37.

The square root of 55507690 is about 7450.3483140052. The cubic root of 55507690 is about 381.4617979310.

The spelling of 55507690 in words is "fifty-five million, five hundred seven thousand, six hundred ninety".