83640253 has 4 divisors (see below), whose sum is σ = 83753568. Its totient is φ = 83526940.

The previous prime is 83640251. The next prime is 83640257. The reversal of 83640253 is 35204638.

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 83640253 - 2¹ = 83640251 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83640251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55543 + ... + 57028.

It is an arithmetic number, because the mean of its divisors is an integer number (20938392).

Almost surely, 2^83640253 is an apocalyptic number.

It is an amenable number.

83640253 is a deficient number, since it is larger than the sum of its proper divisors (113315).

83640253 is a wasteful number, since it uses less digits than its factorization.

83640253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113314.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 83640253 is about 9145.5045240818. The cubic root of 83640253 is about 437.3258134339.

The spelling of 83640253 in words is "eighty-three million, six hundred forty thousand, two hundred fifty-three".