671573856 has 48 divisors (see below), whose sum is σ = 1767080448. Its totient is φ = 223324800.

The previous prime is 671573789. The next prime is 671573869. The reversal of 671573856 is 658375176.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×671573856² = 902022888125417472, which contains 22 as substring.

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, 33261 + ... + 49491.

It is an arithmetic number, because the mean of its divisors is an integer number (36814176).

Almost surely, 2^671573856 is an apocalyptic number.

It is an amenable number.

671573856 is an abundant number, since it is smaller than the sum of its proper divisors (1095506592).

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

671573856 is a wasteful number, since it uses less digits than its factorization.

671573856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16675 (or 16667 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 48.

The square root of 671573856 is about 25914.7420592990. The cubic root of 671573856 is about 875.7186394414.

The spelling of 671573856 in words is "six hundred seventy-one million, five hundred seventy-three thousand, eight hundred fifty-six".