671465856 has 64 divisors (see below), whose sum is σ = 1827126000. Its totient is φ = 218357760.

The previous prime is 671465827. The next prime is 671465867. The reversal of 671465856 is 658564176.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 5581 + ... + 37068.

Almost surely, 2^671465856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671465856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913563000).

671465856 is an abundant number, since it is smaller than the sum of its proper divisors (1155660144).

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

671465856 is a wasteful number, since it uses less digits than its factorization.

671465856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42707 (or 42695 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 48.

The square root of 671465856 is about 25912.6582194880. The cubic root of 671465856 is about 875.6716936575.

The spelling of 671465856 in words is "six hundred seventy-one million, four hundred sixty-five thousand, eight hundred fifty-six".