289778738 has 6 divisors (see below), whose sum is σ = 434704221. Its totient is φ = 144877332.

The previous prime is 289778737. The next prime is 289778767. The reversal of 289778738 is 837877982.

It can be written as a sum of positive squares in 2 ways, for example, as 170903329 + 118875409 = 13073^2 + 10903^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=12037.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289778737) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18056 + ... + 30092.

Almost surely, 2^289778738 is an apocalyptic number.

289778738 is a deficient number, since it is larger than the sum of its proper divisors (144925483).

289778738 is an frugal number, since it uses more digits than its factorization.

289778738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24076 (or 12039 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 59.

The square root of 289778738 is about 17022.8886502849. Note that the first 3 decimals coincide. The cubic root of 289778738 is about 661.7422121302.

The spelling of 289778738 in words is "two hundred eighty-nine million, seven hundred seventy-eight thousand, seven hundred thirty-eight".