640362774 has 32 divisors (see below), whose sum is σ = 1333898496. Its totient is φ = 204755040.

The previous prime is 640362773. The next prime is 640362781. The reversal of 640362774 is 477263046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640362773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4552 + ... + 36075.

It is an arithmetic number, because the mean of its divisors is an integer number (41684328).

Almost surely, 2^640362774 is an apocalyptic number.

640362774 is an abundant number, since it is smaller than the sum of its proper divisors (693535722).

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

640362774 is a wasteful number, since it uses less digits than its factorization.

640362774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40740.

The product of its (nonzero) digits is 169344, while the sum is 39.

The square root of 640362774 is about 25305.3902163156. The cubic root of 640362774 is about 861.9366729425.

The spelling of 640362774 in words is "six hundred forty million, three hundred sixty-two thousand, seven hundred seventy-four".