28440073065 has 16 divisors (see below), whose sum is σ = 45507158208. Its totient is φ = 15167025216.

The previous prime is 28440073063. The next prime is 28440073073. The reversal of 28440073065 is 56037004482.

It is a happy number.

It is not a de Polignac number, because 28440073065 - 2¹ = 28440073063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28440073061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205302 + ... + 314688.

It is an arithmetic number, because the mean of its divisors is an integer number (2844197388).

Almost surely, 2^28440073065 is an apocalyptic number.

It is an amenable number.

28440073065 is a deficient number, since it is larger than the sum of its proper divisors (17067085143).

28440073065 is a wasteful number, since it uses less digits than its factorization.

28440073065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126728.

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 28440073065 in words is "twenty-eight billion, four hundred forty million, seventy-three thousand, sixty-five".