55956720 has 80 divisors (see below), whose sum is σ = 175167360. Its totient is φ = 14775552.

The previous prime is 55956713. The next prime is 55956731. The reversal of 55956720 is 2765955.

It is a tau number, because it is divible by the number of its divisors (80).

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, 24591 + ... + 26769.

It is an arithmetic number, because the mean of its divisors is an integer number (2189592).

Almost surely, 2^55956720 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 55956720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87583680).

55956720 is an abundant number, since it is smaller than the sum of its proper divisors (119210640).

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

55956720 is a wasteful number, since it uses less digits than its factorization.

55956720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 94500, while the sum is 39.

The square root of 55956720 is about 7480.4224479638. The cubic root of 55956720 is about 382.4876496504.

The spelling of 55956720 in words is "fifty-five million, nine hundred fifty-six thousand, seven hundred twenty".