78779023 has 2 divisors, whose sum is σ = 78779024. Its totient is φ = 78779022.

The previous prime is 78779017. The next prime is 78779027. The reversal of 78779023 is 32097787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78779023 - 2⁵ = 78778991 is a prime.

It is a super-2 number, since 2×78779023² = 12412268929669058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78779027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39389511 + 39389512.

It is an arithmetic number, because the mean of its divisors is an integer number (39389512).

Almost surely, 2^78779023 is an apocalyptic number.

78779023 is a deficient number, since it is larger than the sum of its proper divisors (1).

78779023 is an equidigital number, since it uses as much as digits as its factorization.

78779023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 78779023 is about 8875.7547848056. The cubic root of 78779023 is about 428.6835943927.

It can be divided in two parts, 7877 and 9023, that added together give a square (16900 = 130²).

The spelling of 78779023 in words is "seventy-eight million, seven hundred seventy-nine thousand, twenty-three".