28216523655 has 12 divisors (see below), whose sum is σ = 48908641080. Its totient is φ = 15048812592.

The previous prime is 28216523627. The next prime is 28216523663. The reversal of 28216523655 is 55632561282.

28216523655 is a `hidden beast` number, since 28 + 216 + 52 + 365 + 5 = 666.

It is not a de Polignac number, because 28216523655 - 2¹¹ = 28216521607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 627033859 = 28216523655 / (2 + 8 + 2 + 1 + 6 + 5 + 2 + 3 + 6 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28216523655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313516885 + ... + 313516974.

It is an arithmetic number, because the mean of its divisors is an integer number (4075720090).

Almost surely, 2^28216523655 is an apocalyptic number.

28216523655 is a deficient number, since it is larger than the sum of its proper divisors (20692117425).

28216523655 is a wasteful number, since it uses less digits than its factorization.

28216523655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627033870 (or 627033867 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 28216523655 in words is "twenty-eight billion, two hundred sixteen million, five hundred twenty-three thousand, six hundred fifty-five".