671868964 has 30 divisors (see below), whose sum is σ = 1273964734. Its totient is φ = 310040640.

The previous prime is 671868919. The next prime is 671868973. The reversal of 671868964 is 469868176.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 470456100 + 201412864 = 21690^2 + 14192^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 111304 + ... + 117184.

Almost surely, 2^671868964 is an apocalyptic number.

It is an amenable number.

671868964 is a deficient number, since it is larger than the sum of its proper divisors (602095770).

671868964 is an equidigital number, since it uses as much as digits as its factorization.

671868964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5937 (or 5896 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 55.

The square root of 671868964 is about 25920.4352586912. The cubic root of 671868964 is about 875.8468922658.

The spelling of 671868964 in words is "six hundred seventy-one million, eight hundred sixty-eight thousand, nine hundred sixty-four".