78938289 has 12 divisors (see below), whose sum is σ = 114314356. Its totient is φ = 52490592.

The previous prime is 78938221. The next prime is 78938311. The reversal of 78938289 is 98283987.

It can be written as a sum of positive squares in 2 ways, for example, as 63728289 + 15210000 = 7983^2 + 3900^2 .

It is not a de Polignac number, because 78938289 - 2⁸ = 78938033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78938219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7474 + ... + 14619.

Almost surely, 2^78938289 is an apocalyptic number.

It is an amenable number.

78938289 is a deficient number, since it is larger than the sum of its proper divisors (35376067).

78938289 is a wasteful number, since it uses less digits than its factorization.

78938289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22496 (or 22493 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 78938289 is about 8884.7222241328. The cubic root of 78938289 is about 428.9722869933.

The spelling of 78938289 in words is "seventy-eight million, nine hundred thirty-eight thousand, two hundred eighty-nine".