28890012 has 24 divisors (see below), whose sum is σ = 67905936. Its totient is φ = 9559168.

The previous prime is 28889989. The next prime is 28890031. The reversal of 28890012 is 21009882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7143 + ... + 10430.

It is an arithmetic number, because the mean of its divisors is an integer number (2829414).

Almost surely, 2^28890012 is an apocalyptic number.

It is an amenable number.

28890012 is an abundant number, since it is smaller than the sum of its proper divisors (39015924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28890012 is a wasteful number, since it uses less digits than its factorization.

28890012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17717 (or 17715 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28890012 is about 5374.9429764417. The cubic root of 28890012 is about 306.8427790152.

Adding to 28890012 its reverse (21009882), we get a palindrome (49899894).

The spelling of 28890012 in words is "twenty-eight million, eight hundred ninety thousand, twelve".