28669999 has 4 divisors (see below), whose sum is σ = 28965664. Its totient is φ = 28374336.

The previous prime is 28669967. The next prime is 28670003. The reversal of 28669999 is 99996682.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28669999 - 2⁵ = 28669967 is a prime.

It is a Duffinian number.

28669999 is a modest number, since divided by 9999 gives 2866 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28669919) 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, 147687 + ... + 147880.

It is an arithmetic number, because the mean of its divisors is an integer number (7241416).

Almost surely, 2^28669999 is an apocalyptic number.

28669999 is a deficient number, since it is larger than the sum of its proper divisors (295665).

28669999 is an equidigital number, since it uses as much as digits as its factorization.

28669999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295664.

The product of its digits is 3779136, while the sum is 58.

The square root of 28669999 is about 5354.4373187105. The cubic root of 28669999 is about 306.0618689602.

The spelling of 28669999 in words is "twenty-eight million, six hundred sixty-nine thousand, nine hundred ninety-nine".