28233121788 has 36 divisors (see below), whose sum is σ = 71422973440. Its totient is φ = 9403667136.

The previous prime is 28233121781. The next prime is 28233121817. The reversal of 28233121788 is 88712133282.

28233121788 is a `hidden beast` number, since 28 + 2 + 331 + 217 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28233121781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260545 + ... + 352632.

Almost surely, 2^28233121788 is an apocalyptic number.

It is an amenable number.

28233121788 is an abundant number, since it is smaller than the sum of its proper divisors (43189851652).

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

28233121788 is a wasteful number, since it uses less digits than its factorization.

28233121788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614466 (or 614461 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The spelling of 28233121788 in words is "twenty-eight billion, two hundred thirty-three million, one hundred twenty-one thousand, seven hundred eighty-eight".