28929869 has 4 divisors (see below), whose sum is σ = 30631644. Its totient is φ = 27228096.

The previous prime is 28929853. The next prime is 28929877. The reversal of 28929869 is 96892982.

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 24255625 + 4674244 = 4925^2 + 2162^2 .

It is a cyclic number.

It is not a de Polignac number, because 28929869 - 2⁴ = 28929853 is a prime.

It is a super-2 number, since 2×28929869² = 1673874640714322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28929869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28929809) 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, 850862 + ... + 850895.

It is an arithmetic number, because the mean of its divisors is an integer number (7657911).

Almost surely, 2^28929869 is an apocalyptic number.

It is an amenable number.

28929869 is a deficient number, since it is larger than the sum of its proper divisors (1701775).

28929869 is a wasteful number, since it uses less digits than its factorization.

28929869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701774.

The product of its digits is 1119744, while the sum is 53.

The square root of 28929869 is about 5378.6493657795. The cubic root of 28929869 is about 306.9838221412.

The spelling of 28929869 in words is "twenty-eight million, nine hundred twenty-nine thousand, eight hundred sixty-nine".