78768251 has 4 divisors (see below), whose sum is σ = 78786504. Its totient is φ = 78750000.

The previous prime is 78768233. The next prime is 78768271. The reversal of 78768251 is 15286787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78768251 - 2²⁶ = 11659387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78768211) 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, 1376 + ... + 12626.

It is an arithmetic number, because the mean of its divisors is an integer number (19696626).

Almost surely, 2^78768251 is an apocalyptic number.

78768251 is a deficient number, since it is larger than the sum of its proper divisors (18253).

78768251 is a wasteful number, since it uses less digits than its factorization.

78768251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18252.

The product of its digits is 188160, while the sum is 44.

The square root of 78768251 is about 8875.1479424289. The cubic root of 78768251 is about 428.6640545457.

The spelling of 78768251 in words is "seventy-eight million, seven hundred sixty-eight thousand, two hundred fifty-one".