28515839 has 8 divisors (see below), whose sum is σ = 31146960. Its totient is φ = 25891200.

The previous prime is 28515829. The next prime is 28515841. The reversal of 28515839 is 93851582.

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 28515839 - 2⁸ = 28515583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28515796 and 28515805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28515829) 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, 15509 + ... + 17249.

It is an arithmetic number, because the mean of its divisors is an integer number (3893370).

Almost surely, 2^28515839 is an apocalyptic number.

28515839 is a deficient number, since it is larger than the sum of its proper divisors (2631121).

28515839 is a wasteful number, since it uses less digits than its factorization.

28515839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241.

The product of its digits is 86400, while the sum is 41.

The square root of 28515839 is about 5340.0223782303. The cubic root of 28515839 is about 305.5123128569.

The spelling of 28515839 in words is "twenty-eight million, five hundred fifteen thousand, eight hundred thirty-nine".