8640253 has 4 divisors (see below), whose sum is σ = 8769280. Its totient is φ = 8511228.

The previous prime is 8640251. The next prime is 8640259. The reversal of 8640253 is 3520468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8640253 - 2¹ = 8640251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64413 + ... + 64546.

It is an arithmetic number, because the mean of its divisors is an integer number (2192320).

Almost surely, 2^8640253 is an apocalyptic number.

It is an amenable number.

8640253 is a deficient number, since it is larger than the sum of its proper divisors (129027).

8640253 is a wasteful number, since it uses less digits than its factorization.

8640253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129026.

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

The square root of 8640253 is about 2939.4307271987. The cubic root of 8640253 is about 205.1991164701.

The spelling of 8640253 in words is "eight million, six hundred forty thousand, two hundred fifty-three".