28739865 has 64 divisors (see below), whose sum is σ = 58060800. Its totient is φ = 11792640.

The previous prime is 28739863. The next prime is 28739873. The reversal of 28739865 is 56893782.

It is not a de Polignac number, because 28739865 - 2¹ = 28739863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28739863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 172012 + ... + 172178.

It is an arithmetic number, because the mean of its divisors is an integer number (907200).

Almost surely, 2^28739865 is an apocalyptic number.

It is an amenable number.

28739865 is an abundant number, since it is smaller than the sum of its proper divisors (29320935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28739865 is a wasteful number, since it uses less digits than its factorization.

28739865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342.

The product of its digits is 725760, while the sum is 48.

The square root of 28739865 is about 5360.9574704525. The cubic root of 28739865 is about 306.3102816223.

The spelling of 28739865 in words is "twenty-eight million, seven hundred thirty-nine thousand, eight hundred sixty-five".