28859969 has 4 divisors (see below), whose sum is σ = 28879044. Its totient is φ = 28840896.

The previous prime is 28859953. The next prime is 28859981. The reversal of 28859969 is 96995882.

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 19465744 + 9394225 = 4412^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 28859969 - 2⁴ = 28859953 is a prime.

It is a super-2 number, since 2×28859969² = 1665795621361922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28859939) 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, 7052 + ... + 10365.

It is an arithmetic number, because the mean of its divisors is an integer number (7219761).

Almost surely, 2^28859969 is an apocalyptic number.

It is an amenable number.

28859969 is a deficient number, since it is larger than the sum of its proper divisors (19075).

28859969 is a wasteful number, since it uses less digits than its factorization.

28859969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19074.

The product of its digits is 2799360, while the sum is 56.

The square root of 28859969 is about 5372.1475221740. The cubic root of 28859969 is about 306.7363792103.

The spelling of 28859969 in words is "twenty-eight million, eight hundred fifty-nine thousand, nine hundred sixty-nine".