289257345 has 64 divisors (see below), whose sum is σ = 566818560. Its totient is φ = 139055616.

The previous prime is 289257343. The next prime is 289257389. The reversal of 289257345 is 543752982.

289257345 is a `hidden beast` number, since 289 + 25 + 7 + 345 = 666.

It is not a de Polignac number, because 289257345 - 2¹ = 289257343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 289257345.

It is not an unprimeable number, because it can be changed into a prime (289257343) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73549 + ... + 77381.

It is an arithmetic number, because the mean of its divisors is an integer number (8856540).

Almost surely, 2^289257345 is an apocalyptic number.

It is an amenable number.

289257345 is a deficient number, since it is larger than the sum of its proper divisors (277561215).

289257345 is a wasteful number, since it uses less digits than its factorization.

289257345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903 (or 3897 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 289257345 is about 17007.5672863582. The cubic root of 289257345 is about 661.3450874130.

The spelling of 289257345 in words is "two hundred eighty-nine million, two hundred fifty-seven thousand, three hundred forty-five".