55989615 has 16 divisors (see below), whose sum is σ = 97727616. Its totient is φ = 27146400.

The previous prime is 55989611. The next prime is 55989623. The reversal of 55989615 is 51698955.

It is a happy number.

It is not a de Polignac number, because 55989615 - 2² = 55989611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55989611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169501 + ... + 169830.

It is an arithmetic number, because the mean of its divisors is an integer number (6107976).

Almost surely, 2^55989615 is an apocalyptic number.

55989615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55989615 is a deficient number, since it is larger than the sum of its proper divisors (41738001).

55989615 is a wasteful number, since it uses less digits than its factorization.

55989615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339350.

The product of its digits is 486000, while the sum is 48.

The square root of 55989615 is about 7482.6208643763. The cubic root of 55989615 is about 382.5625853420.

The spelling of 55989615 in words is "fifty-five million, nine hundred eighty-nine thousand, six hundred fifteen".