28233121785 has 48 divisors (see below), whose sum is σ = 49846987008. Its totient is φ = 13635297280.

The previous prime is 28233121781. The next prime is 28233121817. The reversal of 28233121785 is 58712133282.

It is not a de Polignac number, because 28233121785 - 2² = 28233121781 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 436192 + ... + 496718.

It is an arithmetic number, because the mean of its divisors is an integer number (1038478896).

Almost surely, 2^28233121785 is an apocalyptic number.

It is an amenable number.

28233121785 is a deficient number, since it is larger than the sum of its proper divisors (21613865223).

28233121785 is a wasteful number, since it uses less digits than its factorization.

28233121785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60814 (or 60803 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The spelling of 28233121785 in words is "twenty-eight billion, two hundred thirty-three million, one hundred twenty-one thousand, seven hundred eighty-five".