28537516865 has 16 divisors (see below), whose sum is σ = 40231912896. Its totient is φ = 19158052800.

The previous prime is 28537516807. The next prime is 28537516907. The reversal of 28537516865 is 56861573582.

It is a happy number.

It is not a de Polignac number, because 28537516865 - 2¹⁶ = 28537451329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28537516865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19955591 + ... + 19957020.

It is an arithmetic number, because the mean of its divisors is an integer number (2514494556).

Almost surely, 2^28537516865 is an apocalyptic number.

It is an amenable number.

28537516865 is a deficient number, since it is larger than the sum of its proper divisors (11694396031).

28537516865 is a wasteful number, since it uses less digits than its factorization.

28537516865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39912640.

The product of its digits is 12096000, while the sum is 56.

The spelling of 28537516865 in words is "twenty-eight billion, five hundred thirty-seven million, five hundred sixteen thousand, eight hundred sixty-five".