78115279 has 8 divisors (see below), whose sum is σ = 86296320. Its totient is φ = 70114200.

The previous prime is 78115273. The next prime is 78115309. The reversal of 78115279 is 97251187.

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 78115279 - 2⁷ = 78115151 is a prime.

It is a super-2 number, since 2×78115279² = 12203993626495682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78115273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44077 + ... + 45814.

It is an arithmetic number, because the mean of its divisors is an integer number (10787040).

Almost surely, 2^78115279 is an apocalyptic number.

78115279 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

78115279 is a deficient number, since it is larger than the sum of its proper divisors (8181041).

78115279 is a wasteful number, since it uses less digits than its factorization.

78115279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89981.

The product of its digits is 35280, while the sum is 40.

The square root of 78115279 is about 8838.2848449233. The cubic root of 78115279 is about 427.4762550791.

The spelling of 78115279 in words is "seventy-eight million, one hundred fifteen thousand, two hundred seventy-nine".