28959893 has 4 divisors (see below), whose sum is σ = 29958540. Its totient is φ = 27961248.

The previous prime is 28959881. The next prime is 28959907. The reversal of 28959893 is 39895982.

It is a happy number.

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 17623204 + 11336689 = 4198^2 + 3367^2 .

It is a cyclic number.

It is not a de Polignac number, because 28959893 - 2⁴ = 28959877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28958893) 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, 499280 + ... + 499337.

It is an arithmetic number, because the mean of its divisors is an integer number (7489635).

Almost surely, 2^28959893 is an apocalyptic number.

It is an amenable number.

28959893 is a deficient number, since it is larger than the sum of its proper divisors (998647).

28959893 is an equidigital number, since it uses as much as digits as its factorization.

28959893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998646.

The product of its digits is 1399680, while the sum is 53.

The square root of 28959893 is about 5381.4396772611. The cubic root of 28959893 is about 307.0899834195.

The spelling of 28959893 in words is "twenty-eight million, nine hundred fifty-nine thousand, eight hundred ninety-three".