640572373 has 8 divisors (see below), whose sum is σ = 732300480. Its totient is φ = 548898720.

The previous prime is 640572371. The next prime is 640572389. The reversal of 640572373 is 373275046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640572373 - 2¹ = 640572371 is a prime.

It is a super-2 number, since 2×640572373² = 820665930101702258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640572371) 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 7 ways as a sum of consecutive naturals, for example, 15858 + ... + 39148.

It is an arithmetic number, because the mean of its divisors is an integer number (91537560).

Almost surely, 2^640572373 is an apocalyptic number.

It is an amenable number.

640572373 is a deficient number, since it is larger than the sum of its proper divisors (91728107).

640572373 is a wasteful number, since it uses less digits than its factorization.

640572373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27227.

The product of its (nonzero) digits is 105840, while the sum is 37.

The square root of 640572373 is about 25309.5312678840. The cubic root of 640572373 is about 862.0307036829.

It can be divided in two parts, 64057 and 2373, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 640572373 in words is "six hundred forty million, five hundred seventy-two thousand, three hundred seventy-three".