78732769 has 2 divisors, whose sum is σ = 78732770. Its totient is φ = 78732768.

The previous prime is 78732757. The next prime is 78732779. The reversal of 78732769 is 96723787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 1292769 = 8800^2 + 1137^2 .

It is a cyclic number.

It is not a de Polignac number, because 78732769 - 2⁵ = 78732737 is a prime.

It is a super-2 number, since 2×78732769² = 12397697828814722, which contains 22 as substring.

It is equal to p_4599778 and since 78732769 and 4599778 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (78732739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39366384 + 39366385.

It is an arithmetic number, because the mean of its divisors is an integer number (39366385).

Almost surely, 2^78732769 is an apocalyptic number.

It is an amenable number.

78732769 is a deficient number, since it is larger than the sum of its proper divisors (1).

78732769 is an equidigital number, since it uses as much as digits as its factorization.

78732769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 78732769 is about 8873.1487646720. The cubic root of 78732769 is about 428.5996794446.

The spelling of 78732769 in words is "seventy-eight million, seven hundred thirty-two thousand, seven hundred sixty-nine".