55387689 has 12 divisors (see below), whose sum is σ = 85907664. Its totient is φ = 31650024.

The previous prime is 55387681. The next prime is 55387697. The reversal of 55387689 is 98678355.

It is an interprime number because it is at equal distance from previous prime (55387681) and next prime (55387697).

It is not a de Polignac number, because 55387689 - 2³ = 55387681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55387681) 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, 188247 + ... + 188540.

It is an arithmetic number, because the mean of its divisors is an integer number (7158972).

Almost surely, 2^55387689 is an apocalyptic number.

It is an amenable number.

55387689 is a deficient number, since it is larger than the sum of its proper divisors (30519975).

55387689 is a wasteful number, since it uses less digits than its factorization.

55387689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376804 (or 376797 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 51.

The square root of 55387689 is about 7442.2905748163. The cubic root of 55387689 is about 381.1867079740.

The spelling of 55387689 in words is "fifty-five million, three hundred eighty-seven thousand, six hundred eighty-nine".