28890051761 has 8 divisors (see below), whose sum is σ = 30363023040. Its totient is φ = 27435154032.

The previous prime is 28890051739. The next prime is 28890051763. The reversal of 28890051761 is 16715009882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28890051761 is a prime.

It is a super-2 number, since 2×28890051761² (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 7 ways as a sum of consecutive naturals, for example, 4515110 + ... + 4521503.

It is an arithmetic number, because the mean of its divisors is an integer number (3795377880).

Almost surely, 2^28890051761 is an apocalyptic number.

It is an amenable number.

28890051761 is a deficient number, since it is larger than the sum of its proper divisors (1472971279).

28890051761 is a wasteful number, since it uses less digits than its factorization.

28890051761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9036775.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 28890051761 in words is "twenty-eight billion, eight hundred ninety million, fifty-one thousand, seven hundred sixty-one".