78819157 has 8 divisors (see below), whose sum is σ = 83958336. Its totient is φ = 73735872.

The previous prime is 78819133. The next prime is 78819161. The reversal of 78819157 is 75191887.

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 78819157 - 2⁷ = 78819029 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 (78819857) 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, 11043 + ... + 16720.

It is an arithmetic number, because the mean of its divisors is an integer number (10494792).

Almost surely, 2^78819157 is an apocalyptic number.

It is an amenable number.

78819157 is a deficient number, since it is larger than the sum of its proper divisors (5139179).

78819157 is a wasteful number, since it uses less digits than its factorization.

78819157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27947.

The product of its digits is 141120, while the sum is 46.

The square root of 78819157 is about 8878.0153750712. The cubic root of 78819157 is about 428.7563797015.

The spelling of 78819157 in words is "seventy-eight million, eight hundred nineteen thousand, one hundred fifty-seven".