641740764 has 24 divisors (see below), whose sum is σ = 1711308928. Its totient is φ = 183354480.

The previous prime is 641740763. The next prime is 641740783. The reversal of 641740764 is 467047146.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641740763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3819802 + ... + 3819969.

Almost surely, 2^641740764 is an apocalyptic number.

It is an amenable number.

641740764 is an abundant number, since it is smaller than the sum of its proper divisors (1069568164).

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

641740764 is a wasteful number, since it uses less digits than its factorization.

641740764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7639785 (or 7639783 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 641740764 is about 25332.6027877121. The cubic root of 641740764 is about 862.5544941834.

The spelling of 641740764 in words is "six hundred forty-one million, seven hundred forty thousand, seven hundred sixty-four".