671764990 has 32 divisors (see below), whose sum is σ = 1347101280. Its totient is φ = 239481984.

The previous prime is 671764949. The next prime is 671764991. The reversal of 671764990 is 99467176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671764991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85324 + ... + 92863.

It is an arithmetic number, because the mean of its divisors is an integer number (42096915).

Almost surely, 2^671764990 is an apocalyptic number.

671764990 is an abundant number, since it is smaller than the sum of its proper divisors (675336290).

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

671764990 is a wasteful number, since it uses less digits than its factorization.

671764990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178236.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 671764990 is about 25918.4295434735. The cubic root of 671764990 is about 875.8017098430.

The spelling of 671764990 in words is "six hundred seventy-one million, seven hundred sixty-four thousand, nine hundred ninety".