28010989 has 4 divisors (see below), whose sum is σ = 28037056. Its totient is φ = 27984924.

The previous prime is 28010971. The next prime is 28011023. The reversal of 28010989 is 98901082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28010989 - 2¹¹ = 28008941 is a prime.

It is a Duffinian number.

28010989 is a modest number, since divided by 10989 gives 28 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28010909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11349 + ... + 13594.

It is an arithmetic number, because the mean of its divisors is an integer number (7009264).

Almost surely, 2^28010989 is an apocalyptic number.

It is an amenable number.

28010989 is a deficient number, since it is larger than the sum of its proper divisors (26067).

28010989 is a wasteful number, since it uses less digits than its factorization.

28010989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26066.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 28010989 is about 5292.5408831676. The cubic root of 28010989 is about 303.6986170825.

The spelling of 28010989 in words is "twenty-eight million, ten thousand, nine hundred eighty-nine".