640576730 has 16 divisors (see below), whose sum is σ = 1160676864. Its totient is φ = 254533200.

The previous prime is 640576721. The next prime is 640576733. The reversal of 640576730 is 37675046.

It is not an unprimeable number, because it can be changed into a prime (640576733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210602 + ... + 213621.

It is an arithmetic number, because the mean of its divisors is an integer number (72542304).

Almost surely, 2^640576730 is an apocalyptic number.

640576730 is a deficient number, since it is larger than the sum of its proper divisors (520100134).

640576730 is a wasteful number, since it uses less digits than its factorization.

640576730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424381.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 640576730 is about 25309.6173420303. The cubic root of 640576730 is about 862.0326581117.

The spelling of 640576730 in words is "six hundred forty million, five hundred seventy-six thousand, seven hundred thirty".