28689994 has 8 divisors (see below), whose sum is σ = 43058628. Its totient is φ = 14337120.

The previous prime is 28689979. The next prime is 28690001. The reversal of 28689994 is 49998682.

It can be written as a sum of positive squares in 2 ways, for example, as 25755625 + 2934369 = 5075^2 + 1713^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3204 + ... + 8224.

Almost surely, 2^28689994 is an apocalyptic number.

28689994 is a deficient number, since it is larger than the sum of its proper divisors (14368634).

28689994 is a wasteful number, since it uses less digits than its factorization.

28689994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7880.

The product of its digits is 2239488, while the sum is 55.

The square root of 28689994 is about 5356.3041362492. The cubic root of 28689994 is about 306.1330035395.

The spelling of 28689994 in words is "twenty-eight million, six hundred eighty-nine thousand, nine hundred ninety-four".