55512987 has 16 divisors (see below), whose sum is σ = 76288800. Its totient is φ = 35880192.

The previous prime is 55512979. The next prime is 55513001. The reversal of 55512987 is 78921555.

It is not a de Polignac number, because 55512987 - 2³ = 55512979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55512187) 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, 38023 + ... + 39455.

It is an arithmetic number, because the mean of its divisors is an integer number (4768050).

Almost surely, 2^55512987 is an apocalyptic number.

55512987 is a deficient number, since it is larger than the sum of its proper divisors (20775813).

55512987 is a wasteful number, since it uses less digits than its factorization.

55512987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822.

The product of its digits is 126000, while the sum is 42.

The square root of 55512987 is about 7450.7037922602. The cubic root of 55512987 is about 381.4739316184.

The spelling of 55512987 in words is "fifty-five million, five hundred twelve thousand, nine hundred eighty-seven".