664047986 has 16 divisors (see below), whose sum is σ = 1198282560. Its totient is φ = 269613360.

The previous prime is 664047977. The next prime is 664048037. The reversal of 664047986 is 689740466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1247945 + ... + 1248476.

It is an arithmetic number, because the mean of its divisors is an integer number (74892660).

Almost surely, 2^664047986 is an apocalyptic number.

664047986 is a deficient number, since it is larger than the sum of its proper divisors (534234574).

664047986 is a wasteful number, since it uses less digits than its factorization.

664047986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496449.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The square root of 664047986 is about 25769.1285456067. The cubic root of 664047986 is about 872.4351496806.

The spelling of 664047986 in words is "six hundred sixty-four million, forty-seven thousand, nine hundred eighty-six".