78819253 has 4 divisors (see below), whose sum is σ = 78837280. Its totient is φ = 78801228.

The previous prime is 78819241. The next prime is 78819311. The reversal of 78819253 is 35291887.

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 78819253 - 2⁹ = 78818741 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 (78819553) 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, 2176 + ... + 12742.

It is an arithmetic number, because the mean of its divisors is an integer number (19709320).

Almost surely, 2^78819253 is an apocalyptic number.

It is an amenable number.

78819253 is a deficient number, since it is larger than the sum of its proper divisors (18027).

78819253 is a wasteful number, since it uses less digits than its factorization.

78819253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18026.

The product of its digits is 120960, while the sum is 43.

The square root of 78819253 is about 8878.0207816833. The cubic root of 78819253 is about 428.7565537733.

The spelling of 78819253 in words is "seventy-eight million, eight hundred nineteen thousand, two hundred fifty-three".