78828751 has 8 divisors (see below), whose sum is σ = 82566144. Its totient is φ = 75117240.

The previous prime is 78828733. The next prime is 78828787. The reversal of 78828751 is 15782887.

It is a happy number.

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 78828751 - 2²⁵ = 45274319 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 (78828721) 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, 91 + ... + 12556.

It is an arithmetic number, because the mean of its divisors is an integer number (10320768).

Almost surely, 2^78828751 is an apocalyptic number.

78828751 is a deficient number, since it is larger than the sum of its proper divisors (3737393).

78828751 is a wasteful number, since it uses less digits than its factorization.

78828751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12941.

The product of its digits is 250880, while the sum is 46.

The square root of 78828751 is about 8878.5556820915. Note that the first 3 decimals coincide. The cubic root of 78828751 is about 428.7737753109.

The spelling of 78828751 in words is "seventy-eight million, eight hundred twenty-eight thousand, seven hundred fifty-one".