28233121786 has 4 divisors (see below), whose sum is σ = 42349682682. Its totient is φ = 14116560892.

The previous prime is 28233121781. The next prime is 28233121817. The reversal of 28233121786 is 68712133282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25975446561 + 2257675225 = 161169^2 + 47515^2 .

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 as a sum of consecutive naturals, namely, 7058280445 + ... + 7058280448.

Almost surely, 2^28233121786 is an apocalyptic number.

28233121786 is a deficient number, since it is larger than the sum of its proper divisors (14116560896).

28233121786 is a wasteful number, since it uses less digits than its factorization.

28233121786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14116560895.

The product of its digits is 193536, while the sum is 43.

The spelling of 28233121786 in words is "twenty-eight billion, two hundred thirty-three million, one hundred twenty-one thousand, seven hundred eighty-six".