640734754 has 8 divisors (see below), whose sum is σ = 1048475088. Its totient is φ = 291243060.

The previous prime is 640734733. The next prime is 640734767. The reversal of 640734754 is 457437046.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 14562132 + ... + 14562175.

It is an arithmetic number, because the mean of its divisors is an integer number (131059386).

Almost surely, 2^640734754 is an apocalyptic number.

640734754 is a deficient number, since it is larger than the sum of its proper divisors (407740334).

640734754 is a wasteful number, since it uses less digits than its factorization.

640734754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29124320.

The product of its (nonzero) digits is 282240, while the sum is 40.

The square root of 640734754 is about 25312.7389667732. The cubic root of 640734754 is about 862.1035372858.

The spelling of 640734754 in words is "six hundred forty million, seven hundred thirty-four thousand, seven hundred fifty-four".