55609920 has 84 divisors (see below), whose sum is σ = 191284860. Its totient is φ = 14828544.

The previous prime is 55609913. The next prime is 55609921. The reversal of 55609920 is 2990655.

55609920 is a `hidden beast` number, since 5 + 560 + 9 + 92 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13307904 + 42302016 = 3648^2 + 6504^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55609921) 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, 6775 + ... + 12534.

Almost surely, 2^55609920 is an apocalyptic number.

It is an amenable number.

55609920 is an abundant number, since it is smaller than the sum of its proper divisors (135674940).

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

55609920 is a wasteful number, since it uses less digits than its factorization.

55609920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19332 (or 19319 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 55609920 is about 7457.2059110635. The cubic root of 55609920 is about 381.6958371159.

The spelling of 55609920 in words is "fifty-five million, six hundred nine thousand, nine hundred twenty".