78722565 has 16 divisors (see below), whose sum is σ = 126111168. Its totient is φ = 41933696.

The previous prime is 78722561. The next prime is 78722573. The reversal of 78722565 is 56522787.

It is a cyclic number.

It is not a de Polignac number, because 78722565 - 2² = 78722561 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78722561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11542 + ... + 17048.

It is an arithmetic number, because the mean of its divisors is an integer number (7881948).

Almost surely, 2^78722565 is an apocalyptic number.

It is an amenable number.

78722565 is a deficient number, since it is larger than the sum of its proper divisors (47388603).

78722565 is a wasteful number, since it uses less digits than its factorization.

78722565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6468.

The product of its digits is 235200, while the sum is 42.

The square root of 78722565 is about 8872.5737528634. The cubic root of 78722565 is about 428.5811627154.

The spelling of 78722565 in words is "seventy-eight million, seven hundred twenty-two thousand, five hundred sixty-five".