289649645 has 4 divisors (see below), whose sum is σ = 347579580. Its totient is φ = 231719712.

The previous prime is 289649641. The next prime is 289649669. The reversal of 289649645 is 546946982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31147561 + 258502084 = 5581^2 + 16078^2 .

It is a cyclic number.

It is not a de Polignac number, because 289649645 - 2² = 289649641 is a prime.

It is a super-3 number, since 3×289649645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289649641) 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, 28964960 + ... + 28964969.

It is an arithmetic number, because the mean of its divisors is an integer number (86894895).

Almost surely, 2^289649645 is an apocalyptic number.

It is an amenable number.

289649645 is a deficient number, since it is larger than the sum of its proper divisors (57929935).

289649645 is an equidigital number, since it uses as much as digits as its factorization.

289649645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57929934.

The product of its digits is 3732480, while the sum is 53.

The square root of 289649645 is about 17019.0964801308. The cubic root of 289649645 is about 661.6439314252.

The spelling of 289649645 in words is "two hundred eighty-nine million, six hundred forty-nine thousand, six hundred forty-five".