28515863 has 8 divisors (see below), whose sum is σ = 29353632. Its totient is φ = 27681696.

The previous prime is 28515841. The next prime is 28515871. The reversal of 28515863 is 36851582.

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 28515863 - 2¹² = 28511767 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 (28515463) 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, 29006 + ... + 29972.

It is an arithmetic number, because the mean of its divisors is an integer number (3669204).

Almost surely, 2^28515863 is an apocalyptic number.

28515863 is a deficient number, since it is larger than the sum of its proper divisors (837769).

28515863 is an equidigital number, since it uses as much as digits as its factorization.

28515863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801.

The product of its digits is 57600, while the sum is 38.

The square root of 28515863 is about 5340.0246254114. The cubic root of 28515863 is about 305.5123985671.

The spelling of 28515863 in words is "twenty-eight million, five hundred fifteen thousand, eight hundred sixty-three".