78811379 has 4 divisors (see below), whose sum is σ = 78830280. Its totient is φ = 78792480.

The previous prime is 78811333. The next prime is 78811423. The reversal of 78811379 is 97311887.

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

It is a cyclic number.

It is not a de Polignac number, because 78811379 - 2⁸ = 78811123 is a prime.

It is a super-2 number, since 2×78811379² = 12422466919763282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78811309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134 + ... + 12555.

It is an arithmetic number, because the mean of its divisors is an integer number (19707570).

Almost surely, 2^78811379 is an apocalyptic number.

78811379 is a deficient number, since it is larger than the sum of its proper divisors (18901).

78811379 is a wasteful number, since it uses less digits than its factorization.

78811379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18900.

The product of its digits is 84672, while the sum is 44.

The square root of 78811379 is about 8877.5773159123. The cubic root of 78811379 is about 428.7422757833.

It can be divided in two parts, 788 and 11379, that added together give a cube (12167 = 23³).

The spelling of 78811379 in words is "seventy-eight million, eight hundred eleven thousand, three hundred seventy-nine".