55555587 has 12 divisors (see below), whose sum is σ = 80569944. Its totient is φ = 36888000.

The previous prime is 55555579. The next prime is 55555631. The reversal of 55555587 is 78555555.

It is a happy number.

It is not a de Polignac number, because 55555587 - 2³ = 55555579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55555517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10038 + ... + 14555.

It is an arithmetic number, because the mean of its divisors is an integer number (6714162).

Almost surely, 2^55555587 is an apocalyptic number.

55555587 is a deficient number, since it is larger than the sum of its proper divisors (25014357).

55555587 is a wasteful number, since it uses less digits than its factorization.

55555587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24850 (or 24847 counting only the distinct ones).

The product of its digits is 875000, while the sum is 45.

The square root of 55555587 is about 7453.5620343565. The cubic root of 55555587 is about 381.5714861742.

The spelling of 55555587 in words is "fifty-five million, five hundred fifty-five thousand, five hundred eighty-seven".