640416260 has 48 divisors (see below), whose sum is σ = 1471538880. Its totient is φ = 232179840.

The previous prime is 640416241. The next prime is 640416277. The reversal of 640416260 is 62614046.

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, 72146 + ... + 80534.

It is an arithmetic number, because the mean of its divisors is an integer number (30657060).

Almost surely, 2^640416260 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 640416260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735769440).

640416260 is an abundant number, since it is smaller than the sum of its proper divisors (831122620).

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

640416260 is a wasteful number, since it uses less digits than its factorization.

640416260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8756 (or 8754 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 640416260 is about 25306.4470046666. The cubic root of 640416260 is about 861.9606698930.

The spelling of 640416260 in words is "six hundred forty million, four hundred sixteen thousand, two hundred sixty".