78689245 has 8 divisors (see below), whose sum is σ = 95263416. Its totient is φ = 62393856.

The previous prime is 78689239. The next prime is 78689249. The reversal of 78689245 is 54298687.

It can be written as a sum of positive squares in 4 ways, for example, as 9566649 + 69122596 = 3093^2 + 8314^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78689245 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78689249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69072 + ... + 70201.

It is an arithmetic number, because the mean of its divisors is an integer number (11907927).

Almost surely, 2^78689245 is an apocalyptic number.

It is an amenable number.

78689245 is a deficient number, since it is larger than the sum of its proper divisors (16574171).

78689245 is a wasteful number, since it uses less digits than its factorization.

78689245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139391.

The product of its digits is 967680, while the sum is 49.

The square root of 78689245 is about 8870.6958577104. The cubic root of 78689245 is about 428.5206872995.

The spelling of 78689245 in words is "seventy-eight million, six hundred eighty-nine thousand, two hundred forty-five".