78828251 has 2 divisors, whose sum is σ = 78828252. Its totient is φ = 78828250.

The previous prime is 78828229. The next prime is 78828271. The reversal of 78828251 is 15282887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78828251 - 2⁶ = 78828187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78828199 and 78828208.

It is not a weakly prime, because it can be changed into another prime (78828271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39414125 + 39414126.

It is an arithmetic number, because the mean of its divisors is an integer number (39414126).

Almost surely, 2^78828251 is an apocalyptic number.

78828251 is a deficient number, since it is larger than the sum of its proper divisors (1).

78828251 is an equidigital number, since it uses as much as digits as its factorization.

78828251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71680, while the sum is 41.

The square root of 78828251 is about 8878.5275243139. The cubic root of 78828251 is about 428.7728687578.

The spelling of 78828251 in words is "seventy-eight million, eight hundred twenty-eight thousand, two hundred fifty-one".