640974453 has 16 divisors (see below), whose sum is σ = 983754240. Its totient is φ = 363634416.

The previous prime is 640974431. The next prime is 640974473. The reversal of 640974453 is 354479046.

It is not a de Polignac number, because 640974453 - 2¹² = 640970357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640974413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106875 + ... + 112712.

It is an arithmetic number, because the mean of its divisors is an integer number (61484640).

Almost surely, 2^640974453 is an apocalyptic number.

It is an amenable number.

640974453 is a deficient number, since it is larger than the sum of its proper divisors (342779787).

640974453 is a wasteful number, since it uses less digits than its factorization.

640974453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219736.

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 640974453 is about 25317.4732744008. The cubic root of 640974453 is about 862.2110282516.

The spelling of 640974453 in words is "six hundred forty million, nine hundred seventy-four thousand, four hundred fifty-three".