28899009 has 6 divisors (see below), whose sum is σ = 41743026. Its totient is φ = 19266000.

The previous prime is 28899007. The next prime is 28899011. The reversal of 28899009 is 90099882.

It is an interprime number because it is at equal distance from previous prime (28899007) and next prime (28899011).

It can be written as a sum of positive squares in only one way, i.e., 20793600 + 8105409 = 4560^2 + 2847^2 .

It is not a de Polignac number, because 28899009 - 2¹ = 28899007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28899001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1605492 + ... + 1605509.

It is an arithmetic number, because the mean of its divisors is an integer number (6957171).

Almost surely, 2^28899009 is an apocalyptic number.

It is an amenable number.

28899009 is a deficient number, since it is larger than the sum of its proper divisors (12844017).

28899009 is a wasteful number, since it uses less digits than its factorization.

28899009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211007 (or 3211004 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 28899009 is about 5375.7798504031. The cubic root of 28899009 is about 306.8746282918.

The spelling of 28899009 in words is "twenty-eight million, eight hundred ninety-nine thousand, nine".