66957280 has 48 divisors (see below), whose sum is σ = 170360064. Its totient is φ = 24721920.

The previous prime is 66957229. The next prime is 66957287. The reversal of 66957280 is 8275966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66957287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14016 + ... + 18175.

It is an arithmetic number, because the mean of its divisors is an integer number (3549168).

Almost surely, 2^66957280 is an apocalyptic number.

It is an amenable number.

66957280 is an abundant number, since it is smaller than the sum of its proper divisors (103402784).

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

66957280 is a wasteful number, since it uses less digits than its factorization.

66957280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32219 (or 32211 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 66957280 is about 8182.7428164400. The cubic root of 66957280 is about 406.0684686390.

The spelling of 66957280 in words is "sixty-six million, nine hundred fifty-seven thousand, two hundred eighty".