640081074 has 16 divisors (see below), whose sum is σ = 1284787008. Its totient is φ = 212589552.

The previous prime is 640081073. The next prime is 640081097. The reversal of 640081074 is 470180046.

640081074 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (640081073) 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, 190902 + ... + 194225.

It is an arithmetic number, because the mean of its divisors is an integer number (80299188).

Almost surely, 2^640081074 is an apocalyptic number.

640081074 is an abundant number, since it is smaller than the sum of its proper divisors (644705934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640081074 is a wasteful number, since it uses less digits than its factorization.

640081074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385409.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 640081074 is about 25299.8235962230. The cubic root of 640081074 is about 861.8102637759.

The spelling of 640081074 in words is "six hundred forty million, eighty-one thousand, seventy-four".