646565260 has 48 divisors (see below), whose sum is σ = 1483437312. Its totient is φ = 234763200.

The previous prime is 646565251. The next prime is 646565261. The reversal of 646565260 is 62565646.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (646565261) 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, 179275 + ... + 182845.

It is an arithmetic number, because the mean of its divisors is an integer number (30904944).

Almost surely, 2^646565260 is an apocalyptic number.

It is an amenable number.

646565260 is an abundant number, since it is smaller than the sum of its proper divisors (836872052).

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

646565260 is a wasteful number, since it uses less digits than its factorization.

646565260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 646565260 is about 25427.6475514350. The cubic root of 646565260 is about 864.7106118724.

The spelling of 646565260 in words is "six hundred forty-six million, five hundred sixty-five thousand, two hundred sixty".