660864080 has 80 divisors (see below), whose sum is σ = 1626324480. Its totient is φ = 249048576.

The previous prime is 660864047. The next prime is 660864089. The reversal of 660864080 is 80468066.

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

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660864089) 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, 298337 + ... + 300543.

It is an arithmetic number, because the mean of its divisors is an integer number (20329056).

Almost surely, 2^660864080 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 660864080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (813162240).

660864080 is an abundant number, since it is smaller than the sum of its proper divisors (965460400).

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

660864080 is a wasteful number, since it uses less digits than its factorization.

660864080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436 (or 2430 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 660864080 is about 25707.2767908233. The cubic root of 660864080 is about 871.0385624269.

The spelling of 660864080 in words is "six hundred sixty million, eight hundred sixty-four thousand, eighty".