78437289 has 24 divisors (see below), whose sum is σ = 124497120. Its totient is φ = 43775424.

The previous prime is 78437279. The next prime is 78437329. The reversal of 78437289 is 98273487.

It is not a de Polignac number, because 78437289 - 2¹⁶ = 78371753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78437209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117 + ... + 12525.

It is an arithmetic number, because the mean of its divisors is an integer number (5187380).

Almost surely, 2^78437289 is an apocalyptic number.

It is an amenable number.

78437289 is a deficient number, since it is larger than the sum of its proper divisors (46059831).

78437289 is a wasteful number, since it uses less digits than its factorization.

78437289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12469 (or 12462 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 78437289 is about 8856.4828797892. The cubic root of 78437289 is about 428.0628365104.

The spelling of 78437289 in words is "seventy-eight million, four hundred thirty-seven thousand, two hundred eighty-nine".