640451413 has 24 divisors (see below), whose sum is σ = 772208640. Its totient is φ = 529068960.

The previous prime is 640451401. The next prime is 640451419. The reversal of 640451413 is 314154046.

It is not a de Polignac number, because 640451413 - 2¹⁷ = 640320341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640451419) 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 23 ways as a sum of consecutive naturals, for example, 444348 + ... + 445786.

It is an arithmetic number, because the mean of its divisors is an integer number (32175360).

Almost surely, 2^640451413 is an apocalyptic number.

It is an amenable number.

640451413 is a deficient number, since it is larger than the sum of its proper divisors (131757227).

640451413 is a wasteful number, since it uses less digits than its factorization.

640451413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1770 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 640451413 is about 25307.1415414701. The cubic root of 640451413 is about 861.9764408589.

The spelling of 640451413 in words is "six hundred forty million, four hundred fifty-one thousand, four hundred thirteen".