640459737 has 16 divisors (see below), whose sum is σ = 949250880. Its totient is φ = 426783456.

The previous prime is 640459727. The next prime is 640459739. The reversal of 640459737 is 737954046.

640459737 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 640459737 - 2⁷ = 640459609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640459692 and 640459701.

It is not an unprimeable number, because it can be changed into a prime (640459739) 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, 84298 + ... + 91580.

It is an arithmetic number, because the mean of its divisors is an integer number (59328180).

Almost surely, 2^640459737 is an apocalyptic number.

It is an amenable number.

640459737 is a deficient number, since it is larger than the sum of its proper divisors (308791143).

640459737 is a wasteful number, since it uses less digits than its factorization.

640459737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10549 (or 10543 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 640459737 is about 25307.3060004418. The cubic root of 640459737 is about 861.9801752358.

The spelling of 640459737 in words is "six hundred forty million, four hundred fifty-nine thousand, seven hundred thirty-seven".