28528722651 has 32 divisors (see below), whose sum is σ = 45009941760. Its totient is φ = 15845270400.

The previous prime is 28528722643. The next prime is 28528722697. The reversal of 28528722651 is 15622782582.

It is a happy number.

It is not a de Polignac number, because 28528722651 - 2³ = 28528722643 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28528722651.

It is not an unprimeable number, because it can be changed into a prime (28528722611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179580 + ... + 298841.

It is an arithmetic number, because the mean of its divisors is an integer number (1406560680).

Almost surely, 2^28528722651 is an apocalyptic number.

28528722651 is a deficient number, since it is larger than the sum of its proper divisors (16481219109).

28528722651 is a wasteful number, since it uses less digits than its factorization.

28528722651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478587.

The product of its digits is 1075200, while the sum is 48.

The spelling of 28528722651 in words is "twenty-eight billion, five hundred twenty-eight million, seven hundred twenty-two thousand, six hundred fifty-one".