55971280 has 20 divisors (see below), whose sum is σ = 130133412. Its totient is φ = 22388480.

The previous prime is 55971239. The next prime is 55971281. The reversal of 55971280 is 8217955.

It can be written as a sum of positive squares in 2 ways, for example, as 35141184 + 20830096 = 5928^2 + 4564^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55971281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349741 + ... + 349900.

Almost surely, 2^55971280 is an apocalyptic number.

It is an amenable number.

55971280 is an abundant number, since it is smaller than the sum of its proper divisors (74162132).

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

55971280 is a wasteful number, since it uses less digits than its factorization.

55971280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699654 (or 699648 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 55971280 is about 7481.3955917329. The cubic root of 55971280 is about 382.5208213423.

The spelling of 55971280 in words is "fifty-five million, nine hundred seventy-one thousand, two hundred eighty".