640884377 has 36 divisors (see below), whose sum is σ = 799634304. Its totient is φ = 512023680.

The previous prime is 640884371. The next prime is 640884379. The reversal of 640884377 is 773488046.

640884377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640884377 - 2¹² = 640880281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640884371) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2364752 + ... + 2365022.

It is an arithmetic number, because the mean of its divisors is an integer number (22212064).

Almost surely, 2^640884377 is an apocalyptic number.

It is an amenable number.

640884377 is a deficient number, since it is larger than the sum of its proper divisors (158749927).

640884377 is a wasteful number, since it uses less digits than its factorization.

640884377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 47.

The square root of 640884377 is about 25315.6942824012. The cubic root of 640884377 is about 862.1706375836.

The spelling of 640884377 in words is "six hundred forty million, eight hundred eighty-four thousand, three hundred seventy-seven".