641495232 has 168 divisors, whose sum is σ = 2111959200. Its totient is φ = 182366208.

The previous prime is 641495219. The next prime is 641495243. The reversal of 641495232 is 232594146.

It is a happy number.

641495232 is a `hidden beast` number, since 6 + 414 + 9 + 5 + 232 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×641495232² = 823032265357467648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (51840) is a multiple of the sum of its prime divisors (810).

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, 1568244 + ... + 1568652.

Almost surely, 2^641495232 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 641495232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055979600).

641495232 is an abundant number, since it is smaller than the sum of its proper divisors (1470463968).

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

641495232 is a wasteful number, since it uses less digits than its factorization.

641495232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823 (or 810 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 641495232 is about 25327.7561580176. The cubic root of 641495232 is about 862.4444748124. Note that the first 4 decimals are identical.

The spelling of 641495232 in words is "six hundred forty-one million, four hundred ninety-five thousand, two hundred thirty-two".