641863488 has 56 divisors (see below), whose sum is σ = 1940876992. Its totient is φ = 183389184.

The previous prime is 641863471. The next prime is 641863493. The reversal of 641863488 is 884368146.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×641863488² = 823977474455052288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237445 + ... + 240132.

Almost surely, 2^641863488 is an apocalyptic number.

It is an amenable number.

641863488 is an abundant number, since it is smaller than the sum of its proper divisors (1299013504).

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

641863488 is a wasteful number, since it uses less digits than its factorization.

641863488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477599 (or 477589 counting only the distinct ones).

The product of its digits is 884736, while the sum is 48.

The square root of 641863488 is about 25335.0249259794. The cubic root of 641863488 is about 862.6094745309.

The spelling of 641863488 in words is "six hundred forty-one million, eight hundred sixty-three thousand, four hundred eighty-eight".