28792909 has 8 divisors (see below), whose sum is σ = 29179800. Its totient is φ = 28408896.

The previous prime is 28792903. The next prime is 28792913. The reversal of 28792909 is 90929782.

It can be written as a sum of positive squares in 4 ways, for example, as 469225 + 28323684 = 685^2 + 5322^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28792909 - 2¹⁷ = 28661837 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 (28792903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25219 + ... + 26335.

It is an arithmetic number, because the mean of its divisors is an integer number (3647475).

Almost surely, 2^28792909 is an apocalyptic number.

It is an amenable number.

28792909 is a deficient number, since it is larger than the sum of its proper divisors (386891).

28792909 is a wasteful number, since it uses less digits than its factorization.

28792909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 28792909 is about 5365.9024404102. The cubic root of 28792909 is about 306.4986139472.

The spelling of 28792909 in words is "twenty-eight million, seven hundred ninety-two thousand, nine hundred nine".