28996609 has 4 divisors (see below), whose sum is σ = 29013040. Its totient is φ = 28980180.

The previous prime is 28996601. The next prime is 28996621. The reversal of 28996609 is 90669982.

It is a happy number.

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 28996609 - 2³ = 28996601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28996601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5199 + ... + 9220.

It is an arithmetic number, because the mean of its divisors is an integer number (7253260).

Almost surely, 2^28996609 is an apocalyptic number.

It is an amenable number.

28996609 is a deficient number, since it is larger than the sum of its proper divisors (16431).

28996609 is a wasteful number, since it uses less digits than its factorization.

28996609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16430.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 28996609 is about 5384.8499514843. The cubic root of 28996609 is about 307.2197071290.

The spelling of 28996609 in words is "twenty-eight million, nine hundred ninety-six thousand, six hundred nine".