66570880 has 128 divisors (see below), whose sum is σ = 169646400. Its totient is φ = 24944640.

The previous prime is 66570877. The next prime is 66570887. The reversal of 66570880 is 8807566.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (66570887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1128291 + ... + 1128349.

Almost surely, 2^66570880 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 66570880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84823200).

66570880 is an abundant number, since it is smaller than the sum of its proper divisors (103075520).

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

66570880 is a wasteful number, since it uses less digits than its factorization.

66570880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 66570880 is about 8159.0979893613. The cubic root of 66570880 is about 405.2858420043.

The spelling of 66570880 in words is "sixty-six million, five hundred seventy thousand, eight hundred eighty".