641797632 has 240 divisors, whose sum is σ = 2148692832. Its totient is φ = 180633600.

The previous prime is 641797603. The next prime is 641797669. The reversal of 641797632 is 236797146.

641797632 is a `hidden beast` number, since 6 + 4 + 1 + 7 + 9 + 7 + 632 = 666.

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 23 ways as a sum of consecutive naturals, for example, 3257758 + ... + 3257954.

Almost surely, 2^641797632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641797632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074346416).

641797632 is an abundant number, since it is smaller than the sum of its proper divisors (1506895200).

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

641797632 is a wasteful number, since it uses less digits than its factorization.

641797632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 310 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 641797632 is about 25333.7251899518. The cubic root of 641797632 is about 862.5799719168.

The spelling of 641797632 in words is "six hundred forty-one million, seven hundred ninety-seven thousand, six hundred thirty-two".