28236223551 has 16 divisors (see below), whose sum is σ = 40908170240. Its totient is φ = 17258132160.

The previous prime is 28236223541. The next prime is 28236223637. The reversal of 28236223551 is 15532263282.

It is not a de Polignac number, because 28236223551 - 2²⁷ = 28102005823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28236223501) 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, 7988110 + ... + 7991643.

It is an arithmetic number, because the mean of its divisors is an integer number (2556760640).

Almost surely, 2^28236223551 is an apocalyptic number.

28236223551 is a deficient number, since it is larger than the sum of its proper divisors (12671946689).

28236223551 is a wasteful number, since it uses less digits than its factorization.

28236223551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15979806.

The product of its digits is 172800, while the sum is 39.

The spelling of 28236223551 in words is "twenty-eight billion, two hundred thirty-six million, two hundred twenty-three thousand, five hundred fifty-one".