28890862887 has 8 divisors (see below), whose sum is σ = 38733975280. Its totient is φ = 19154162880.

The previous prime is 28890862877. The next prime is 28890862933. The reversal of 28890862887 is 78826809882.

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

It is not a de Polignac number, because 28890862887 - 2²⁰ = 28889814311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28890862837) 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, 26602462 + ... + 26603547.

It is an arithmetic number, because the mean of its divisors is an integer number (4841746910).

Almost surely, 2^28890862887 is an apocalyptic number.

28890862887 is a deficient number, since it is larger than the sum of its proper divisors (9843112393).

28890862887 is a wasteful number, since it uses less digits than its factorization.

28890862887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53206193.

The product of its (nonzero) digits is 49545216, while the sum is 66.

The spelling of 28890862887 in words is "twenty-eight billion, eight hundred ninety million, eight hundred sixty-two thousand, eight hundred eighty-seven".