28743865 has 8 divisors (see below), whose sum is σ = 36308160. Its totient is φ = 21784752.

The previous prime is 28743817. The next prime is 28743877. The reversal of 28743865 is 56834782.

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 28743865 - 2¹⁵ = 28711097 is a prime.

It is a nialpdrome in base 12.

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, 151189 + ... + 151378.

It is an arithmetic number, because the mean of its divisors is an integer number (4538520).

Almost surely, 2^28743865 is an apocalyptic number.

It is an amenable number.

28743865 is a deficient number, since it is larger than the sum of its proper divisors (7564295).

28743865 is a wasteful number, since it uses less digits than its factorization.

28743865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302591.

The product of its digits is 322560, while the sum is 43.

The square root of 28743865 is about 5361.3305251588. The cubic root of 28743865 is about 306.3244916669.

The spelling of 28743865 in words is "twenty-eight million, seven hundred forty-three thousand, eight hundred sixty-five".