640245796 has 12 divisors (see below), whose sum is σ = 1130346252. Its totient is φ = 317289728.

The previous prime is 640245787. The next prime is 640245803. The reversal of 640245796 is 697542046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 98287396 + 541958400 = 9914^2 + 23280^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707785 + ... + 708688.

It is an arithmetic number, because the mean of its divisors is an integer number (94195521).

Almost surely, 2^640245796 is an apocalyptic number.

It is an amenable number.

640245796 is a deficient number, since it is larger than the sum of its proper divisors (490100456).

640245796 is a wasteful number, since it uses less digits than its factorization.

640245796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416590 (or 1416588 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 640245796 is about 25303.0787850016. The cubic root of 640245796 is about 861.8841851067.

The spelling of 640245796 in words is "six hundred forty million, two hundred forty-five thousand, seven hundred ninety-six".