671565972 has 108 divisors (see below), whose sum is σ = 2003809920. Its totient is φ = 174414240.

The previous prime is 671565971. The next prime is 671566009. The reversal of 671565972 is 279565176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671565971) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 66429 + ... + 75867.

Almost surely, 2^671565972 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 671565972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1001904960).

671565972 is an abundant number, since it is smaller than the sum of its proper divisors (1332243948).

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

671565972 is a wasteful number, since it uses less digits than its factorization.

671565972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482 (or 9462 counting only the distinct ones).

The product of its digits is 793800, while the sum is 48.

The square root of 671565972 is about 25914.5899446624. The cubic root of 671565972 is about 875.7152125695.

The spelling of 671565972 in words is "six hundred seventy-one million, five hundred sixty-five thousand, nine hundred seventy-two".