78119791 has 4 divisors (see below), whose sum is σ = 78141672. Its totient is φ = 78097912.

The previous prime is 78119749. The next prime is 78119813. The reversal of 78119791 is 19791187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19791187 = 13 ⋅1522399.

It is a cyclic number.

It is not a de Polignac number, because 78119791 - 2⁷ = 78119663 is a prime.

It is a super-2 number, since 2×78119791² = 12205403491767362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78119291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4201 + ... + 13186.

It is an arithmetic number, because the mean of its divisors is an integer number (19535418).

Almost surely, 2^78119791 is an apocalyptic number.

78119791 is a deficient number, since it is larger than the sum of its proper divisors (21881).

78119791 is a wasteful number, since it uses less digits than its factorization.

78119791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21880.

The product of its digits is 31752, while the sum is 43.

The square root of 78119791 is about 8838.5400943821. The cubic root of 78119791 is about 427.4844853757.

The spelling of 78119791 in words is "seventy-eight million, one hundred nineteen thousand, seven hundred ninety-one".