55187615 has 16 divisors (see below), whose sum is σ = 76929600. Its totient is φ = 37221120.

The previous prime is 55187591. The next prime is 55187617. The reversal of 55187615 is 51678155.

It is a happy number.

55187615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-55187615 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55187617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10790 + ... + 15059.

It is an arithmetic number, because the mean of its divisors is an integer number (4808100).

Almost surely, 2^55187615 is an apocalyptic number.

55187615 is a deficient number, since it is larger than the sum of its proper divisors (21741985).

55187615 is a wasteful number, since it uses less digits than its factorization.

55187615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25922.

The product of its digits is 42000, while the sum is 38.

The square root of 55187615 is about 7428.8367191640. The cubic root of 55187615 is about 380.7271740625.

The spelling of 55187615 in words is "fifty-five million, one hundred eighty-seven thousand, six hundred fifteen".