78725251 has 24 divisors (see below), whose sum is σ = 91417536. Its totient is φ = 67217040.

The previous prime is 78725243. The next prime is 78725263. The reversal of 78725251 is 15252787.

It is not a de Polignac number, because 78725251 - 2³ = 78725243 is a prime.

It is a Duffinian number.

Its product of digits (39200) is a multiple of the sum of its prime divisors (280).

It is a self number, because there is not a number n which added to its sum of digits gives 78725251.

It is not an unprimeable number, because it can be changed into a prime (78725281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 482896 + ... + 483058.

It is an arithmetic number, because the mean of its divisors is an integer number (3809064).

Almost surely, 2^78725251 is an apocalyptic number.

78725251 is a deficient number, since it is larger than the sum of its proper divisors (12692285).

78725251 is a wasteful number, since it uses less digits than its factorization.

78725251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 280 counting only the distinct ones).

The product of its digits is 39200, while the sum is 37.

The square root of 78725251 is about 8872.7251168962. The cubic root of 78725251 is about 428.5860370311.

The spelling of 78725251 in words is "seventy-eight million, seven hundred twenty-five thousand, two hundred fifty-one".