289623988 has 12 divisors (see below), whose sum is σ = 507426052. Its totient is φ = 144645120.

The previous prime is 289623977. The next prime is 289623989. The reversal of 289623988 is 889326982.

It can be written as a sum of positive squares in 2 ways, for example, as 242674084 + 46949904 = 15578^2 + 6852^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289623989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37773 + ... + 44788.

Almost surely, 2^289623988 is an apocalyptic number.

It is an amenable number.

289623988 is a deficient number, since it is larger than the sum of its proper divisors (217802064).

289623988 is a wasteful number, since it uses less digits than its factorization.

289623988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83442 (or 83440 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 55.

The square root of 289623988 is about 17018.3426925186. The cubic root of 289623988 is about 661.6243948346.

The spelling of 289623988 in words is "two hundred eighty-nine million, six hundred twenty-three thousand, nine hundred eighty-eight".