28708433 has 8 divisors (see below), whose sum is σ = 31026408. Its totient is φ = 26406144.

The previous prime is 28708429. The next prime is 28708453. The reversal of 28708433 is 33480782.

It can be written as a sum of positive squares in 4 ways, for example, as 5166529 + 23541904 = 2273^2 + 4852^2 .

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 28708433 - 2² = 28708429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28708393 and 28708402.

It is not an unprimeable number, because it can be changed into a prime (28708403) 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, 41 + ... + 7577.

It is an arithmetic number, because the mean of its divisors is an integer number (3878301).

Almost surely, 2^28708433 is an apocalyptic number.

It is an amenable number.

28708433 is a deficient number, since it is larger than the sum of its proper divisors (2317975).

28708433 is a wasteful number, since it uses less digits than its factorization.

28708433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 28708433 is about 5358.0251025914. The cubic root of 28708433 is about 306.1985731778.

The spelling of 28708433 in words is "twenty-eight million, seven hundred eight thousand, four hundred thirty-three".