55387615 has 16 divisors (see below), whose sum is σ = 70555968. Its totient is φ = 41596416.

The previous prime is 55387613. The next prime is 55387639. The reversal of 55387615 is 51678355.

It is not a de Polignac number, because 55387615 - 2¹ = 55387613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55387613) 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, 51574 + ... + 52636.

It is an arithmetic number, because the mean of its divisors is an integer number (4409748).

Almost surely, 2^55387615 is an apocalyptic number.

55387615 is a deficient number, since it is larger than the sum of its proper divisors (15168353).

55387615 is a wasteful number, since it uses less digits than its factorization.

55387615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698.

The product of its digits is 126000, while the sum is 40.

The square root of 55387615 is about 7442.2856032270. The cubic root of 55387615 is about 381.1865382141.

The spelling of 55387615 in words is "fifty-five million, three hundred eighty-seven thousand, six hundred fifteen".