78194879 has 4 divisors (see below), whose sum is σ = 89365584. Its totient is φ = 67024176.

The previous prime is 78194873. The next prime is 78194903. The reversal of 78194879 is 97849187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78194879 is a prime.

It is a super-2 number, since 2×78194879² = 12228878203649282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78194879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78194873) 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, 5585342 + ... + 5585355.

It is an arithmetic number, because the mean of its divisors is an integer number (22341396).

Almost surely, 2^78194879 is an apocalyptic number.

78194879 is a deficient number, since it is larger than the sum of its proper divisors (11170705).

78194879 is a wasteful number, since it uses less digits than its factorization.

78194879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11170704.

The product of its digits is 1016064, while the sum is 53.

The square root of 78194879 is about 8842.7868344770. The cubic root of 78194879 is about 427.6214061897.

The spelling of 78194879 in words is "seventy-eight million, one hundred ninety-four thousand, eight hundred seventy-nine".