641650770 has 24 divisors (see below), whose sum is σ = 1668292236. Its totient is φ = 171106848.

The previous prime is 641650753. The next prime is 641650777. The reversal of 641650770 is 77056146.

641650770 is a `hidden beast` number, since 641 + 6 + 5 + 0 + 7 + 7 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 525463929 + 116186841 = 22923^2 + 10779^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641650777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3564637 + ... + 3564816.

Almost surely, 2^641650770 is an apocalyptic number.

641650770 is an abundant number, since it is smaller than the sum of its proper divisors (1026641466).

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

641650770 is a wasteful number, since it uses less digits than its factorization.

641650770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129466 (or 7129463 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 641650770 is about 25330.8264768444. The cubic root of 641650770 is about 862.5141724199.

The spelling of 641650770 in words is "six hundred forty-one million, six hundred fifty thousand, seven hundred seventy".