78772729 has 16 divisors (see below), whose sum is σ = 94723200. Its totient is φ = 64076544.

The previous prime is 78772711. The next prime is 78772753. The reversal of 78772729 is 92727787.

It is not a de Polignac number, because 78772729 - 2⁷ = 78772601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78772129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8689 + ... + 15265.

It is an arithmetic number, because the mean of its divisors is an integer number (5920200).

Almost surely, 2^78772729 is an apocalyptic number.

It is an amenable number.

78772729 is a deficient number, since it is larger than the sum of its proper divisors (15950471).

78772729 is a wasteful number, since it uses less digits than its factorization.

78772729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6672.

The product of its digits is 691488, while the sum is 49.

The square root of 78772729 is about 8875.4002163283. The cubic root of 78772729 is about 428.6721776208.

The spelling of 78772729 in words is "seventy-eight million, seven hundred seventy-two thousand, seven hundred twenty-nine".