78729851 has 8 divisors (see below), whose sum is σ = 82923264. Its totient is φ = 74600680.

The previous prime is 78729793. The next prime is 78729853. The reversal of 78729851 is 15892787.

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 78729851 - 2¹⁰ = 78728827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78729796 and 78729805.

It is not an unprimeable number, because it can be changed into a prime (78729853) 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, 13535 + ... + 18456.

It is an arithmetic number, because the mean of its divisors is an integer number (10365408).

Almost surely, 2^78729851 is an apocalyptic number.

78729851 is a deficient number, since it is larger than the sum of its proper divisors (4193413).

78729851 is a wasteful number, since it uses less digits than its factorization.

78729851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32121.

The product of its digits is 282240, while the sum is 47.

The square root of 78729851 is about 8872.9843344841. The cubic root of 78729851 is about 428.5943844476.

The spelling of 78729851 in words is "seventy-eight million, seven hundred twenty-nine thousand, eight hundred fifty-one".