641770560 has 112 divisors (see below), whose sum is σ = 2264054400. Its totient is φ = 171136512.

The previous prime is 641770531. The next prime is 641770607. The reversal of 641770560 is 65077146.

641770560 is a `hidden beast` number, since 641 + 7 + 7 + 0 + 5 + 6 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28500 + ... + 45779.

Almost surely, 2^641770560 is an apocalyptic number.

641770560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641770560 is an abundant number, since it is smaller than the sum of its proper divisors (1622283840).

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

641770560 is a wasteful number, since it uses less digits than its factorization.

641770560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74305 (or 74289 counting only the distinct ones).

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

The square root of 641770560 is about 25333.1908767924. The cubic root of 641770560 is about 862.5678434346.

The spelling of 641770560 in words is "six hundred forty-one million, seven hundred seventy thousand, five hundred sixty".