78769385 has 4 divisors (see below), whose sum is σ = 94523268. Its totient is φ = 63015504.

The previous prime is 78769351. The next prime is 78769403. The reversal of 78769385 is 58396787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31214569 + 47554816 = 5587^2 + 6896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78769385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7876934 + ... + 7876943.

It is an arithmetic number, because the mean of its divisors is an integer number (23630817).

Almost surely, 2^78769385 is an apocalyptic number.

It is an amenable number.

78769385 is a deficient number, since it is larger than the sum of its proper divisors (15753883).

78769385 is a wasteful number, since it uses less digits than its factorization.

78769385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15753882.

The product of its digits is 2540160, while the sum is 53.

The square root of 78769385 is about 8875.2118284580. The cubic root of 78769385 is about 428.6661116465. Note that the first 3 decimals are identical.

The spelling of 78769385 in words is "seventy-eight million, seven hundred sixty-nine thousand, three hundred eighty-five".