78929269 has 2 divisors, whose sum is σ = 78929270. Its totient is φ = 78929268.

The previous prime is 78929239. The next prime is 78929273. The reversal of 78929269 is 96292987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78110244 + 819025 = 8838^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 78929269 - 2⁵ = 78929237 is a prime.

It is a super-2 number, since 2×78929269² = 12459659009748722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78929239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39464634 + 39464635.

It is an arithmetic number, because the mean of its divisors is an integer number (39464635).

Almost surely, 2^78929269 is an apocalyptic number.

It is an amenable number.

78929269 is a deficient number, since it is larger than the sum of its proper divisors (1).

78929269 is an equidigital number, since it uses as much as digits as its factorization.

78929269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 78929269 is about 8884.2145966878. The cubic root of 78929269 is about 428.9559473206.

It can be divided in two parts, 7892 and 9269, that added together give a square (17161 = 131²).

The spelling of 78929269 in words is "seventy-eight million, nine hundred twenty-nine thousand, two hundred sixty-nine".