671806464 has 132 divisors (see below), whose sum is σ = 2083420224. Its totient is φ = 191901696.

The previous prime is 671806453. The next prime is 671806507. The reversal of 671806464 is 464608176.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 148297 + ... + 152759.

Almost surely, 2^671806464 is an apocalyptic number.

671806464 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 671806464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041710112).

671806464 is an abundant number, since it is smaller than the sum of its proper divisors (1411613760).

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

671806464 is a wasteful number, since it uses less digits than its factorization.

671806464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500 (or 4475 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 671806464 is about 25919.2296181812. The cubic root of 671806464 is about 875.8197331365.

The spelling of 671806464 in words is "six hundred seventy-one million, eight hundred six thousand, four hundred sixty-four".