671996864 has 112 divisors (see below), whose sum is σ = 1750283520. Its totient is φ = 248002560.

The previous prime is 671996851. The next prime is 671996867. The reversal of 671996864 is 468699176.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671996867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90044 + ... + 97220.

Almost surely, 2^671996864 is an apocalyptic number.

671996864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671996864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875141760).

671996864 is an abundant number, since it is smaller than the sum of its proper divisors (1078286656).

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

671996864 is a wasteful number, since it uses less digits than its factorization.

671996864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226 (or 7216 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 56.

The square root of 671996864 is about 25922.9023066477. The cubic root of 671996864 is about 875.9024654584.

The spelling of 671996864 in words is "six hundred seventy-one million, nine hundred ninety-six thousand, eight hundred sixty-four".