28859690 has 16 divisors (see below), whose sum is σ = 52009128. Its totient is φ = 11530176.

The previous prime is 28859683. The next prime is 28859711. The reversal of 28859690 is 9695882.

It can be written as a sum of positive squares in 4 ways, for example, as 28121809 + 737881 = 5303^2 + 859^2 .

It is a super-2 number, since 2×28859690² = 1665763413792200, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 13964 + ... + 15896.

Almost surely, 2^28859690 is an apocalyptic number.

28859690 is a deficient number, since it is larger than the sum of its proper divisors (23149438).

28859690 is a wasteful number, since it uses less digits than its factorization.

28859690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3433.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 28859690 is about 5372.1215548422. The cubic root of 28859690 is about 306.7353907624.

The spelling of 28859690 in words is "twenty-eight million, eight hundred fifty-nine thousand, six hundred ninety".