671718900438 has 64 divisors (see below), whose sum is σ = 1504662793920. Its totient is φ = 222117831936.

The previous prime is 671718900421. The next prime is 671718900481. The reversal of 671718900438 is 834009817176.

671718900438 is a `hidden beast` number, since 67 + 1 + 71 + 89 + 0 + 0 + 438 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5166720 + ... + 5295132.

It is an arithmetic number, because the mean of its divisors is an integer number (23510356155).

Almost surely, 2^671718900438 is an apocalyptic number.

671718900438 is an abundant number, since it is smaller than the sum of its proper divisors (832943893482).

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

671718900438 is a wasteful number, since it uses less digits than its factorization.

671718900438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129198 (or 129192 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 671718900438 in words is "six hundred seventy-one billion, seven hundred eighteen million, nine hundred thousand, four hundred thirty-eight".