78910257 has 16 divisors (see below), whose sum is σ = 106748928. Its totient is φ = 51844560.

The previous prime is 78910213. The next prime is 78910259. The reversal of 78910257 is 75201987.

It is not a de Polignac number, because 78910257 - 2⁶ = 78910193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78910259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80782 + ... + 81752.

It is an arithmetic number, because the mean of its divisors is an integer number (6671808).

Almost surely, 2^78910257 is an apocalyptic number.

It is an amenable number.

78910257 is a deficient number, since it is larger than the sum of its proper divisors (27838671).

78910257 is a wasteful number, since it uses less digits than its factorization.

78910257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 78910257 is about 8883.1445445855. The cubic root of 78910257 is about 428.9215031258.

The spelling of 78910257 in words is "seventy-eight million, nine hundred ten thousand, two hundred fifty-seven".