78722737 has 2 divisors, whose sum is σ = 78722738. Its totient is φ = 78722736.

The previous prime is 78722731. The next prime is 78722753. The reversal of 78722737 is 73722787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74718736 + 4004001 = 8644^2 + 2001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78722737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78722693 and 78722702.

It is not a weakly prime, because it can be changed into another prime (78722731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39361368 + 39361369.

It is an arithmetic number, because the mean of its divisors is an integer number (39361369).

Almost surely, 2^78722737 is an apocalyptic number.

It is an amenable number.

78722737 is a deficient number, since it is larger than the sum of its proper divisors (1).

78722737 is an equidigital number, since it uses as much as digits as its factorization.

78722737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230496, while the sum is 43.

The square root of 78722737 is about 8872.5834456487. The cubic root of 78722737 is about 428.5814748492.

It can be divided in two parts, 7872 and 2737, that added together give a square (10609 = 103²).

The spelling of 78722737 in words is "seventy-eight million, seven hundred twenty-two thousand, seven hundred thirty-seven".