671664456 has 48 divisors (see below), whose sum is σ = 1820332800. Its totient is φ = 223735392.

The previous prime is 671664449. The next prime is 671664467. The reversal of 671664456 is 654466176.

It is a super-2 number, since 2×671664456² = 902266282907551872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162625 + ... + 166703.

It is an arithmetic number, because the mean of its divisors is an integer number (37923600).

Almost surely, 2^671664456 is an apocalyptic number.

It is an amenable number.

671664456 is an abundant number, since it is smaller than the sum of its proper divisors (1148668344).

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

671664456 is a wasteful number, since it uses less digits than its factorization.

671664456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6378 (or 6371 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 671664456 is about 25916.4900401270. The cubic root of 671664456 is about 875.7580178560.

The spelling of 671664456 in words is "six hundred seventy-one million, six hundred sixty-four thousand, four hundred fifty-six".