28890051769 has 4 divisors (see below), whose sum is σ = 29594687220. Its totient is φ = 28185416320.

The previous prime is 28890051763. The next prime is 28890051781. The reversal of 28890051769 is 96715009882.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15866677369 + 13023374400 = 125963^2 + 114120^2 .

It is a cyclic number.

It is not a de Polignac number, because 28890051769 - 2⁵ = 28890051737 is a prime.

It is a super-2 number, since 2×28890051769² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28890051763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352317664 + ... + 352317745.

It is an arithmetic number, because the mean of its divisors is an integer number (7398671805).

Almost surely, 2^28890051769 is an apocalyptic number.

It is an amenable number.

28890051769 is a deficient number, since it is larger than the sum of its proper divisors (704635451).

28890051769 is an equidigital number, since it uses as much as digits as its factorization.

28890051769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704635450.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 28890051769 in words is "twenty-eight billion, eight hundred ninety million, fifty-one thousand, seven hundred sixty-nine".