78823291 has 2 divisors, whose sum is σ = 78823292. Its totient is φ = 78823290.

The previous prime is 78823273. The next prime is 78823307. The reversal of 78823291 is 19232887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78823291 - 2⁵ = 78823259 is a prime.

It is a super-2 number, since 2×78823291² = 12426222408141362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78823091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39411645 + 39411646.

It is an arithmetic number, because the mean of its divisors is an integer number (39411646).

Almost surely, 2^78823291 is an apocalyptic number.

78823291 is a deficient number, since it is larger than the sum of its proper divisors (1).

78823291 is an equidigital number, since it uses as much as digits as its factorization.

78823291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 78823291 is about 8878.2481943230. The cubic root of 78823291 is about 428.7638755437.

The spelling of 78823291 in words is "seventy-eight million, eight hundred twenty-three thousand, two hundred ninety-one".