640289460 has 48 divisors (see below), whose sum is σ = 1830963456. Its totient is φ = 167110272.

The previous prime is 640289401. The next prime is 640289467. The reversal of 640289460 is 64982046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640289467) 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, 110707 + ... + 116346.

It is an arithmetic number, because the mean of its divisors is an integer number (38145072).

Almost surely, 2^640289460 is an apocalyptic number.

640289460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640289460 is an abundant number, since it is smaller than the sum of its proper divisors (1190673996).

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

640289460 is a wasteful number, since it uses less digits than its factorization.

640289460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227112 (or 227110 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 640289460 is about 25303.9415901950. The cubic root of 640289460 is about 861.9037778193.

The spelling of 640289460 in words is "six hundred forty million, two hundred eighty-nine thousand, four hundred sixty".