640317274 has 32 divisors (see below), whose sum is σ = 1071979920. Its totient is φ = 285422592.

The previous prime is 640317259. The next prime is 640317277. The reversal of 640317274 is 472713046.

It can be written as a sum of positive squares in 8 ways, for example, as 483692049 + 156625225 = 21993^2 + 12515^2 .

It is a super-2 number, since 2×640317274² = 820012422765582152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (640317277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46132 + ... + 58384.

Almost surely, 2^640317274 is an apocalyptic number.

640317274 is a deficient number, since it is larger than the sum of its proper divisors (431662646).

640317274 is a wasteful number, since it uses less digits than its factorization.

640317274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12354.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 640317274 is about 25304.4911823969. The cubic root of 640317274 is about 861.9162579271.

The spelling of 640317274 in words is "six hundred forty million, three hundred seventeen thousand, two hundred seventy-four".