640097284 has 6 divisors (see below), whose sum is σ = 1120170254. Its totient is φ = 320048640.

The previous prime is 640097279. The next prime is 640097287. The reversal of 640097284 is 482790046.

It can be written as a sum of positive squares in only one way, i.e., 628605184 + 11492100 = 25072^2 + 3390^2 .

It is not an unprimeable number, because it can be changed into a prime (640097287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80012157 + ... + 80012164.

Almost surely, 2^640097284 is an apocalyptic number.

It is an amenable number.

640097284 is a deficient number, since it is larger than the sum of its proper divisors (480072970).

640097284 is a wasteful number, since it uses less digits than its factorization.

640097284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160024325 (or 160024323 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 640097284 is about 25300.1439521596. The cubic root of 640097284 is about 861.8175388056.

It can be divided in two parts, 6400 and 97284, that added together give a square (103684 = 322²).

The spelling of 640097284 in words is "six hundred forty million, ninety-seven thousand, two hundred eighty-four".