55615992 has 32 divisors (see below), whose sum is σ = 139380480. Its totient is φ = 18493280.

The previous prime is 55615991. The next prime is 55616003. The reversal of 55615992 is 29951655.

It is a super-2 number, since 2×55615992² = 6186277132288128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55615991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8017 + ... + 13247.

It is an arithmetic number, because the mean of its divisors is an integer number (4355640).

Almost surely, 2^55615992 is an apocalyptic number.

It is an amenable number.

55615992 is an abundant number, since it is smaller than the sum of its proper divisors (83764488).

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

55615992 is a wasteful number, since it uses less digits than its factorization.

55615992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683 (or 5679 counting only the distinct ones).

The product of its digits is 121500, while the sum is 42.

The square root of 55615992 is about 7457.6130229451. The cubic root of 55615992 is about 381.7097289585.

The spelling of 55615992 in words is "fifty-five million, six hundred fifteen thousand, nine hundred ninety-two".