78693705 has 12 divisors (see below), whose sum is σ = 136402500. Its totient is φ = 41969952.

The previous prime is 78693691. The next prime is 78693743. The reversal of 78693705 is 50739687.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33212169 + 45481536 = 5763^2 + 6744^2 .

It is not a de Polignac number, because 78693705 - 2⁵ = 78693673 is a prime.

It is a super-3 number, since 3×78693705³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1748749 = 78693705 / (7 + 8 + 6 + 9 + 3 + 7 + 0 + 5).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 874330 + ... + 874419.

It is an arithmetic number, because the mean of its divisors is an integer number (11366875).

Almost surely, 2^78693705 is an apocalyptic number.

It is an amenable number.

78693705 is a deficient number, since it is larger than the sum of its proper divisors (57708795).

78693705 is a wasteful number, since it uses less digits than its factorization.

78693705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748760 (or 1748757 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 78693705 is about 8870.9472436713. The cubic root of 78693705 is about 428.5287831376.

The spelling of 78693705 in words is "seventy-eight million, six hundred ninety-three thousand, seven hundred five".