28017387 has 8 divisors (see below), whose sum is σ = 41507280. Its totient is φ = 18678240.

The previous prime is 28017331. The next prime is 28017401. The reversal of 28017387 is 78371082.

It is not a de Polignac number, because 28017387 - 2⁸ = 28017131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28017307) 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, 518814 + ... + 518867.

It is an arithmetic number, because the mean of its divisors is an integer number (5188410).

Almost surely, 2^28017387 is an apocalyptic number.

28017387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28017387 is a deficient number, since it is larger than the sum of its proper divisors (13489893).

28017387 is a wasteful number, since it uses less digits than its factorization.

28017387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037690 (or 1037684 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28017387 is about 5293.1452842332. The cubic root of 28017387 is about 303.7217379588.

The spelling of 28017387 in words is "twenty-eight million, seventeen thousand, three hundred eighty-seven".