641667288 has 16 divisors (see below), whose sum is σ = 1604168280. Its totient is φ = 213889088.

The previous prime is 641667277. The next prime is 641667347. The reversal of 641667288 is 882766146.

It is a congruent number.

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, 13368045 + ... + 13368092.

Almost surely, 2^641667288 is an apocalyptic number.

It is an amenable number.

641667288 is an abundant number, since it is smaller than the sum of its proper divisors (962500992).

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

641667288 is a wasteful number, since it uses less digits than its factorization.

641667288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26736146 (or 26736142 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 641667288 is about 25331.1525201677. The cubic root of 641667288 is about 862.5215735835.

The spelling of 641667288 in words is "six hundred forty-one million, six hundred sixty-seven thousand, two hundred eighty-eight".