28231065 has 32 divisors (see below), whose sum is σ = 51926400. Its totient is φ = 14535360.

The previous prime is 28231057. The next prime is 28231079. The reversal of 28231065 is 56013282.

It is not a de Polignac number, because 28231065 - 2³ = 28231057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310 + ... + 7520.

It is an arithmetic number, because the mean of its divisors is an integer number (1622700).

Almost surely, 2^28231065 is an apocalyptic number.

It is an amenable number.

28231065 is a deficient number, since it is larger than the sum of its proper divisors (23695335).

28231065 is a wasteful number, since it uses less digits than its factorization.

28231065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7254 (or 7248 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28231065 is about 5313.2913528245. The cubic root of 28231065 is about 304.4919068926.

The spelling of 28231065 in words is "twenty-eight million, two hundred thirty-one thousand, sixty-five".