28288772330 has 32 divisors (see below), whose sum is σ = 62670513024. Its totient is φ = 8952929856.

The previous prime is 28288772311. The next prime is 28288772341. The reversal of 28288772330 is 3327788282.

It is a happy number.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 15542372 + ... + 15544191.

It is an arithmetic number, because the mean of its divisors is an integer number (1958453532).

Almost surely, 2^28288772330 is an apocalyptic number.

28288772330 is an abundant number, since it is smaller than the sum of its proper divisors (34381740694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28288772330 is a wasteful number, since it uses less digits than its factorization.

28288772330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31086590.

The product of its (nonzero) digits is 1806336, while the sum is 50.

The spelling of 28288772330 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred seventy-two thousand, three hundred thirty".