55645560 has 48 divisors (see below), whose sum is σ = 180849240. Its totient is φ = 14838720.

The previous prime is 55645549. The next prime is 55645571. The reversal of 55645560 is 6554655.

It is a happy number.

55645560 is a `hidden beast` number, since 5 + 5 + 645 + 5 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (55645549) and next prime (55645571).

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

It is a congruent number.

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, 76926 + ... + 77645.

Almost surely, 2^55645560 is an apocalyptic number.

It is an amenable number.

55645560 is an abundant number, since it is smaller than the sum of its proper divisors (125203680).

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

55645560 is a wasteful number, since it uses less digits than its factorization.

55645560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154588 (or 154581 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 55645560 is about 7459.5951632780. The cubic root of 55645560 is about 381.7773617462. Note that the first 3 decimals are identical.

The spelling of 55645560 in words is "fifty-five million, six hundred forty-five thousand, five hundred sixty".