78794431 has 2 divisors, whose sum is σ = 78794432. Its totient is φ = 78794430.

The previous prime is 78794399. The next prime is 78794437. The reversal of 78794431 is 13449787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78794431 - 2⁵ = 78794399 is a prime.

It is a super-2 number, since 2×78794431² = 12417124713227522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78794437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39397215 + 39397216.

It is an arithmetic number, because the mean of its divisors is an integer number (39397216).

Almost surely, 2^78794431 is an apocalyptic number.

78794431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78794431 is an equidigital number, since it uses as much as digits as its factorization.

78794431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 78794431 is about 8876.6227248881. The cubic root of 78794431 is about 428.7115406064.

The spelling of 78794431 in words is "seventy-eight million, seven hundred ninety-four thousand, four hundred thirty-one".