28164989 has 2 divisors, whose sum is σ = 28164990. Its totient is φ = 28164988.

The previous prime is 28164979. The next prime is 28165013. The reversal of 28164989 is 98946182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 13380964 = 3845^2 + 3658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28164989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28164959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14082494 + 14082495.

It is an arithmetic number, because the mean of its divisors is an integer number (14082495).

Almost surely, 2^28164989 is an apocalyptic number.

It is an amenable number.

28164989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28164989 is an equidigital number, since it uses as much as digits as its factorization.

28164989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 28164989 is about 5307.0697187808. The cubic root of 28164989 is about 304.2541625896.

The spelling of 28164989 in words is "twenty-eight million, one hundred sixty-four thousand, nine hundred eighty-nine".