55187685 has 48 divisors (see below), whose sum is σ = 115090560. Its totient is φ = 23898240.

The previous prime is 55187677. The next prime is 55187687. The reversal of 55187685 is 58678155.

It is not a de Polignac number, because 55187685 - 2³ = 55187677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 55187685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55187687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1375 + ... + 10595.

It is an arithmetic number, because the mean of its divisors is an integer number (2397720).

Almost surely, 2^55187685 is an apocalyptic number.

It is an amenable number.

55187685 is an abundant number, since it is smaller than the sum of its proper divisors (59902875).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55187685 is a wasteful number, since it uses less digits than its factorization.

55187685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9258 (or 9255 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 55187685 is about 7428.8414305328. The cubic root of 55187685 is about 380.7273350339.

It can be divided in two parts, 5518 and 7685, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 55187685 in words is "fifty-five million, one hundred eighty-seven thousand, six hundred eighty-five".