78864253 has 8 divisors (see below), whose sum is σ = 87859800. Its totient is φ = 70287168.

The previous prime is 78864229. The next prime is 78864257. The reversal of 78864253 is 35246887.

It can be written as a sum of positive squares in 4 ways, for example, as 45369 + 78818884 = 213^2 + 8878^2 .

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 78864253 - 2⁵ = 78864221 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 (78864257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104218 + ... + 104971.

It is an arithmetic number, because the mean of its divisors is an integer number (10982475).

Almost surely, 2^78864253 is an apocalyptic number.

It is an amenable number.

78864253 is a deficient number, since it is larger than the sum of its proper divisors (8995547).

78864253 is a wasteful number, since it uses less digits than its factorization.

78864253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209231.

The product of its digits is 322560, while the sum is 43.

The square root of 78864253 is about 8880.5547687067. The cubic root of 78864253 is about 428.8381344089.

The spelling of 78864253 in words is "seventy-eight million, eight hundred sixty-four thousand, two hundred fifty-three".