720576666 has 12 divisors (see below), whose sum is σ = 1561249482. Its totient is φ = 240192216.

The previous prime is 720576643. The next prime is 720576673. The reversal of 720576666 is 666675027.

It can be written as a sum of positive squares in only one way, i.e., 606193641 + 114383025 = 24621^2 + 10695^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20016001 + ... + 20016036.

Almost surely, 2^720576666 is an apocalyptic number.

720576666 is an abundant number, since it is smaller than the sum of its proper divisors (840672816).

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

720576666 is a wasteful number, since it uses less digits than its factorization.

720576666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40032045 (or 40032042 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 720576666 is about 26843.5591157358. The cubic root of 720576666 is about 896.5201700633.

The spelling of 720576666 in words is "seven hundred twenty million, five hundred seventy-six thousand, six hundred sixty-six".