671804556 has 48 divisors (see below), whose sum is σ = 1594494720. Its totient is φ = 220104640.

The previous prime is 671804543. The next prime is 671804563. The reversal of 671804556 is 655408176.

It is a super-2 number, since 2×671804556² = 902642722924714272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330415 + ... + 332441.

It is an arithmetic number, because the mean of its divisors is an integer number (33218640).

Almost surely, 2^671804556 is an apocalyptic number.

It is an amenable number.

671804556 is an abundant number, since it is smaller than the sum of its proper divisors (922690164).

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

671804556 is a wasteful number, since it uses less digits than its factorization.

671804556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494 (or 2492 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 671804556 is about 25919.1928115055. The cubic root of 671804556 is about 875.8189039961.

The spelling of 671804556 in words is "six hundred seventy-one million, eight hundred four thousand, five hundred fifty-six".