28276489690 has 16 divisors (see below), whose sum is σ = 50905797480. Its totient is φ = 11308792320.

The previous prime is 28276489673. The next prime is 28276489693. The reversal of 28276489690 is 9698467282.

It can be written as a sum of positive squares in 4 ways, for example, as 26181505249 + 2094984441 = 161807^2 + 45771^2 .

It is a super-2 number, since 2×28276489690² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28276489693) 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, 158655 + ... + 285874.

Almost surely, 2^28276489690 is an apocalyptic number.

28276489690 is a deficient number, since it is larger than the sum of its proper divisors (22629307790).

28276489690 is a wasteful number, since it uses less digits than its factorization.

28276489690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450897.

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 28276489690 in words is "twenty-eight billion, two hundred seventy-six million, four hundred eighty-nine thousand, six hundred ninety".