78719491 has 4 divisors (see below), whose sum is σ = 78741792. Its totient is φ = 78697192.

The previous prime is 78719483. The next prime is 78719497. The reversal of 78719491 is 19491787.

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 78719491 - 2³ = 78719483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78719497) 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, 4555 + ... + 13348.

It is an arithmetic number, because the mean of its divisors is an integer number (19685448).

Almost surely, 2^78719491 is an apocalyptic number.

78719491 is a deficient number, since it is larger than the sum of its proper divisors (22301).

78719491 is a wasteful number, since it uses less digits than its factorization.

78719491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22300.

The product of its digits is 127008, while the sum is 46.

The square root of 78719491 is about 8872.4005207159. The cubic root of 78719491 is about 428.5755841555.

The spelling of 78719491 in words is "seventy-eight million, seven hundred nineteen thousand, four hundred ninety-one".