28001015 has 8 divisors (see below), whose sum is σ = 38401440. Its totient is φ = 19200672.

The previous prime is 28001009. The next prime is 28001047. The reversal of 28001015 is 51010082.

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 28001015 - 2¹⁴ = 27984631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28000984 and 28001002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399980 + ... + 400049.

It is an arithmetic number, because the mean of its divisors is an integer number (4800180).

Almost surely, 2^28001015 is an apocalyptic number.

28001015 is a deficient number, since it is larger than the sum of its proper divisors (10400425).

28001015 is an equidigital number, since it uses as much as digits as its factorization.

28001015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800041.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 28001015 is about 5291.5985297451. The cubic root of 28001015 is about 303.6625663549.

Adding to 28001015 its reverse (51010082), we get a palindrome (79011097).

The spelling of 28001015 in words is "twenty-eight million, one thousand, fifteen".