671345540 has 12 divisors (see below), whose sum is σ = 1409825676. Its totient is φ = 268538208.

The previous prime is 671345539. The next prime is 671345567. The reversal of 671345540 is 45543176.

It can be written as a sum of positive squares in 2 ways, for example, as 514745344 + 156600196 = 22688^2 + 12514^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 671345540.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16783619 + ... + 16783658.

It is an arithmetic number, because the mean of its divisors is an integer number (117485473).

Almost surely, 2^671345540 is an apocalyptic number.

It is an amenable number.

671345540 is an abundant number, since it is smaller than the sum of its proper divisors (738480136).

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

671345540 is a wasteful number, since it uses less digits than its factorization.

671345540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33567286 (or 33567284 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 671345540 is about 25910.3365474090. The cubic root of 671345540 is about 875.6193883873.

The spelling of 671345540 in words is "six hundred seventy-one million, three hundred forty-five thousand, five hundred forty".