640492484 has 12 divisors (see below), whose sum is σ = 1122465708. Its totient is φ = 319788000.

The previous prime is 640492483. The next prime is 640492487. The reversal of 640492484 is 484294046.

It can be written as a sum of positive squares in 2 ways, for example, as 474804100 + 165688384 = 21790^2 + 12872^2 .

It is not an unprimeable number, because it can be changed into a prime (640492481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111407 + ... + 117014.

It is an arithmetic number, because the mean of its divisors is an integer number (93538809).

Almost surely, 2^640492484 is an apocalyptic number.

It is an amenable number.

640492484 is a deficient number, since it is larger than the sum of its proper divisors (481973224).

640492484 is a wasteful number, since it uses less digits than its factorization.

640492484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229126 (or 229124 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 640492484 is about 25307.9529792514. The cubic root of 640492484 is about 861.9948661326.

The spelling of 640492484 in words is "six hundred forty million, four hundred ninety-two thousand, four hundred eighty-four".