664023867 has 24 divisors (see below), whose sum is σ = 980014896. Its totient is φ = 397554048.

The previous prime is 664023863. The next prime is 664023883. The reversal of 664023867 is 768320466.

It is not a de Polignac number, because 664023867 - 2² = 664023863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664023863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47173 + ... + 59609.

It is an arithmetic number, because the mean of its divisors is an integer number (40833954).

Almost surely, 2^664023867 is an apocalyptic number.

664023867 is a deficient number, since it is larger than the sum of its proper divisors (315991029).

664023867 is a wasteful number, since it uses less digits than its factorization.

664023867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12527 (or 12490 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 664023867 is about 25768.6605589037. The cubic root of 664023867 is about 872.4245869309.

The spelling of 664023867 in words is "six hundred sixty-four million, twenty-three thousand, eight hundred sixty-seven".