55985720 has 64 divisors (see below), whose sum is σ = 145843200. Its totient is φ = 18944640.

The previous prime is 55985663. The next prime is 55985731. The reversal of 55985720 is 2758955.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20855 + ... + 23385.

It is an arithmetic number, because the mean of its divisors is an integer number (2278800).

Almost surely, 2^55985720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55985720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72921600).

55985720 is an abundant number, since it is smaller than the sum of its proper divisors (89857480).

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

55985720 is a wasteful number, since it uses less digits than its factorization.

55985720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628 (or 2624 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 55985720 is about 7482.3605900812. The cubic root of 55985720 is about 382.5537139598.

The spelling of 55985720 in words is "fifty-five million, nine hundred eighty-five thousand, seven hundred twenty".