641795528 has 64 divisors (see below), whose sum is σ = 1411430400. Its totient is φ = 270457920.

The previous prime is 641795521. The next prime is 641795537. The reversal of 641795528 is 825597146.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (641795521) 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, 74501 + ... + 82667.

It is an arithmetic number, because the mean of its divisors is an integer number (22053600).

Almost surely, 2^641795528 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 641795528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705715200).

641795528 is an abundant number, since it is smaller than the sum of its proper divisors (769634872).

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

641795528 is a wasteful number, since it uses less digits than its factorization.

641795528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8250 (or 8246 counting only the distinct ones).

The product of its digits is 604800, while the sum is 47.

The square root of 641795528 is about 25333.6836642443. The cubic root of 641795528 is about 862.5790293194.

The spelling of 641795528 in words is "six hundred forty-one million, seven hundred ninety-five thousand, five hundred twenty-eight".