640135744 has 14 divisors (see below), whose sum is σ = 1270269494. Its totient is φ = 320067840.

The previous prime is 640135733. The next prime is 640135807. The reversal of 640135744 is 447531046.

It can be written as a sum of positive squares in only one way, i.e., 583705600 + 56430144 = 24160^2 + 7512^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000997 + ... + 5001124.

Almost surely, 2^640135744 is an apocalyptic number.

640135744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

640135744 is a deficient number, since it is larger than the sum of its proper divisors (630133750).

640135744 is a wasteful number, since it uses less digits than its factorization.

640135744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10002133 (or 10002123 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 640135744 is about 25300.9040154695. The cubic root of 640135744 is about 861.8347991187.

The spelling of 640135744 in words is "six hundred forty million, one hundred thirty-five thousand, seven hundred forty-four".