55637540 has 36 divisors (see below), whose sum is σ = 135916956. Its totient is φ = 19075392.

The previous prime is 55637521. The next prime is 55637563. The reversal of 55637540 is 4573655.

It can be written as a sum of positive squares in 2 ways, for example, as 17172736 + 38464804 = 4144^2 + 6202^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 55637540.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27407 + ... + 29366.

It is an arithmetic number, because the mean of its divisors is an integer number (3775471).

Almost surely, 2^55637540 is an apocalyptic number.

It is an amenable number.

55637540 is an abundant number, since it is smaller than the sum of its proper divisors (80279416).

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

55637540 is a wasteful number, since it uses less digits than its factorization.

55637540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56796 (or 56787 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 35.

The square root of 55637540 is about 7459.0575812230. The cubic root of 55637540 is about 381.7590194528.

The spelling of 55637540 in words is "fifty-five million, six hundred thirty-seven thousand, five hundred forty".