78269423 has 2 divisors, whose sum is σ = 78269424. Its totient is φ = 78269422.

The previous prime is 78269419. The next prime is 78269441. The reversal of 78269423 is 32496287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78269423 - 2² = 78269419 is a prime.

It is a super-2 number, since 2×78269423² = 12252205153505858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78269453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39134711 + 39134712.

It is an arithmetic number, because the mean of its divisors is an integer number (39134712).

Almost surely, 2^78269423 is an apocalyptic number.

78269423 is a deficient number, since it is larger than the sum of its proper divisors (1).

78269423 is an equidigital number, since it uses as much as digits as its factorization.

78269423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 78269423 is about 8847.0007912286. Note that the first 3 decimals coincide. The cubic root of 78269423 is about 427.7572483592.

The spelling of 78269423 in words is "seventy-eight million, two hundred sixty-nine thousand, four hundred twenty-three".