55681636 has 12 divisors (see below), whose sum is σ = 97617520. Its totient is φ = 27790920.

The previous prime is 55681631. The next prime is 55681721. The reversal of 55681636 is 63618655.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (55681631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9906 + ... + 14473.

Almost surely, 2^55681636 is an apocalyptic number.

It is an amenable number.

55681636 is a deficient number, since it is larger than the sum of its proper divisors (41935884).

55681636 is a wasteful number, since it uses less digits than its factorization.

55681636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24954 (or 24952 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 55681636 is about 7462.0128651725. The cubic root of 55681636 is about 381.8598482599.

The spelling of 55681636 in words is "fifty-five million, six hundred eighty-one thousand, six hundred thirty-six".