640345274 has 8 divisors (see below), whose sum is σ = 961890228. Its totient is φ = 319715200.

The previous prime is 640345253. The next prime is 640345283. The reversal of 640345274 is 472543046.

640345274 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 639331225 + 1014049 = 25285^2 + 1007^2 .

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, 226967 + ... + 229770.

Almost surely, 2^640345274 is an apocalyptic number.

640345274 is a deficient number, since it is larger than the sum of its proper divisors (321544954).

640345274 is a wasteful number, since it uses less digits than its factorization.

640345274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457440.

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 640345274 is about 25305.0444378191. The cubic root of 640345274 is about 861.9288211279.

The spelling of 640345274 in words is "six hundred forty million, three hundred forty-five thousand, two hundred seventy-four".