671404956 has 12 divisors (see below), whose sum is σ = 1566611592. Its totient is φ = 223801648.

The previous prime is 671404949. The next prime is 671404961. The reversal of 671404956 is 659404176.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×671404956² = 901569229882723872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27975195 + ... + 27975218.

It is an arithmetic number, because the mean of its divisors is an integer number (130550966).

Almost surely, 2^671404956 is an apocalyptic number.

It is an amenable number.

671404956 is an abundant number, since it is smaller than the sum of its proper divisors (895206636).

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

671404956 is a wasteful number, since it uses less digits than its factorization.

671404956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55950420 (or 55950418 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 671404956 is about 25911.4830914790. The cubic root of 671404956 is about 875.6452192319.

The spelling of 671404956 in words is "six hundred seventy-one million, four hundred four thousand, nine hundred fifty-six".