6660864 has 162 divisors, whose sum is σ = 22719060. Its totient is φ = 1870848.

The previous prime is 6660859. The next prime is 6660911. The reversal of 6660864 is 4680666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 112867 + ... + 112925.

Almost surely, 2^6660864 is an apocalyptic number.

6660864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6660864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11359530).

6660864 is an abundant number, since it is smaller than the sum of its proper divisors (16058196).

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

6660864 is a wasteful number, since it uses less digits than its factorization.

6660864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 6660864 is about 2580.8649712839. The cubic root of 6660864 is about 188.1525847418.

The spelling of 6660864 in words is "six million, six hundred sixty thousand, eight hundred sixty-four".