28890665893 has 8 divisors (see below), whose sum is σ = 30191534208. Its totient is φ = 27618388224.

The previous prime is 28890665831. The next prime is 28890665989. The reversal of 28890665893 is 39856609882.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28890665893 - 2⁹ = 28890665381 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 (28890665093) 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, 7145596 + ... + 7149637.

It is an arithmetic number, because the mean of its divisors is an integer number (3773941776).

Almost surely, 2^28890665893 is an apocalyptic number.

It is an amenable number.

28890665893 is a deficient number, since it is larger than the sum of its proper divisors (1300868315).

28890665893 is a wasteful number, since it uses less digits than its factorization.

28890665893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14295323.

The product of its (nonzero) digits is 44789760, while the sum is 64.

The spelling of 28890665893 in words is "twenty-eight billion, eight hundred ninety million, six hundred sixty-five thousand, eight hundred ninety-three".