55487556 has 36 divisors (see below), whose sum is σ = 145099500. Its totient is φ = 17857728.

The previous prime is 55487533. The next prime is 55487557. The reversal of 55487556 is 65578455.

55487556 is a `hidden beast` number, since 55 + 48 + 7 + 556 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31809600 + 23677956 = 5640^2 + 4866^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (55487557) 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, 25531 + ... + 27618.

Almost surely, 2^55487556 is an apocalyptic number.

It is an amenable number.

55487556 is an abundant number, since it is smaller than the sum of its proper divisors (89611944).

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

55487556 is a wasteful number, since it uses less digits than its factorization.

55487556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53188 (or 53183 counting only the distinct ones).

The product of its digits is 840000, while the sum is 45.

The square root of 55487556 is about 7448.9969794597. The cubic root of 55487556 is about 381.4156705047.

Adding to 55487556 its sum of digits (45), we get a square (55487601 = 7449²).

It can be divided in two parts, 554875 and 56, that added together give a triangular number (554931 = T₁₀₅₃).

The spelling of 55487556 in words is "fifty-five million, four hundred eighty-seven thousand, five hundred fifty-six".