28349808 has 40 divisors (see below), whose sum is σ = 73531008. Its totient is φ = 9412032.

The previous prime is 28349759. The next prime is 28349813. The reversal of 28349808 is 80894382.

It is a happy number.

It is a super-2 number, since 2×28349808² = 1607423227273728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28349808.

It is a congruent number.

It is an unprimeable number.

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, 12541 + ... + 14627.

Almost surely, 2^28349808 is an apocalyptic number.

It is an amenable number.

28349808 is an abundant number, since it is smaller than the sum of its proper divisors (45181200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28349808 is a wasteful number, since it uses less digits than its factorization.

28349808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381 (or 2375 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 28349808 is about 5324.4537748017. The cubic root of 28349808 is about 304.9182186898.

The spelling of 28349808 in words is "twenty-eight million, three hundred forty-nine thousand, eight hundred eight".