28942609 has 8 divisors (see below), whose sum is σ = 30433320. Its totient is φ = 27484800.

The previous prime is 28942601. The next prime is 28942631. The reversal of 28942609 is 90624982.

It can be written as a sum of positive squares in 4 ways, for example, as 51984 + 28890625 = 228^2 + 5375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28942609 - 2³ = 28942601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28942601) 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 7 ways as a sum of consecutive naturals, for example, 6412 + ... + 9949.

It is an arithmetic number, because the mean of its divisors is an integer number (3804165).

Almost surely, 2^28942609 is an apocalyptic number.

28942609 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28942609 is a deficient number, since it is larger than the sum of its proper divisors (1490711).

28942609 is a wasteful number, since it uses less digits than its factorization.

28942609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16451.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 28942609 is about 5379.8335476109. The cubic root of 28942609 is about 307.0288782265.

The spelling of 28942609 in words is "twenty-eight million, nine hundred forty-two thousand, six hundred nine".