640877853 has 32 divisors (see below), whose sum is σ = 1088040960. Its totient is φ = 325834560.

The previous prime is 640877837. The next prime is 640877857. The reversal of 640877853 is 358778046.

It is not a de Polignac number, because 640877853 - 2⁴ = 640877837 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640877857) 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 31 ways as a sum of consecutive naturals, for example, 18658 + ... + 40371.

It is an arithmetic number, because the mean of its divisors is an integer number (34001280).

Almost surely, 2^640877853 is an apocalyptic number.

It is an amenable number.

640877853 is a deficient number, since it is larger than the sum of its proper divisors (447163107).

640877853 is a wasteful number, since it uses less digits than its factorization.

640877853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59097.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The square root of 640877853 is about 25315.5654291979. The cubic root of 640877853 is about 862.1677120323.

The spelling of 640877853 in words is "six hundred forty million, eight hundred seventy-seven thousand, eight hundred fifty-three".