28892813 has 4 divisors (see below), whose sum is σ = 28912380. Its totient is φ = 28873248.

The previous prime is 28892803. The next prime is 28892869. The reversal of 28892813 is 31829882.

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 28697449 + 195364 = 5357^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 28892813 - 2¹⁶ = 28827277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28892803) 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, 7370 + ... + 10587.

It is an arithmetic number, because the mean of its divisors is an integer number (7228095).

Almost surely, 2^28892813 is an apocalyptic number.

It is an amenable number.

28892813 is a deficient number, since it is larger than the sum of its proper divisors (19567).

28892813 is a wasteful number, since it uses less digits than its factorization.

28892813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19566.

The product of its digits is 55296, while the sum is 41.

The square root of 28892813 is about 5375.2035310302. The cubic root of 28892813 is about 306.8526952318.

The spelling of 28892813 in words is "twenty-eight million, eight hundred ninety-two thousand, eight hundred thirteen".