640251674 has 8 divisors (see below), whose sum is σ = 960960000. Its totient is φ = 319931676.

The previous prime is 640251643. The next prime is 640251691. The reversal of 640251674 is 476152046.

640251674 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 92924 + ... + 99575.

It is an arithmetic number, because the mean of its divisors is an integer number (120120000).

Almost surely, 2^640251674 is an apocalyptic number.

640251674 is a deficient number, since it is larger than the sum of its proper divisors (320708326).

640251674 is a wasteful number, since it uses less digits than its factorization.

640251674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194164.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 640251674 is about 25303.1949366083. The cubic root of 640251674 is about 861.8868227082.

The spelling of 640251674 in words is "six hundred forty million, two hundred fifty-one thousand, six hundred seventy-four".