28012499 has 8 divisors (see below), whose sum is σ = 29349888. Its totient is φ = 26702280.

The previous prime is 28012477. The next prime is 28012507. The reversal of 28012499 is 99421082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28012499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28012409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4667 + ... + 8820.

It is an arithmetic number, because the mean of its divisors is an integer number (3668736).

Almost surely, 2^28012499 is an apocalyptic number.

28012499 is a deficient number, since it is larger than the sum of its proper divisors (1337389).

28012499 is a wasteful number, since it uses less digits than its factorization.

28012499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13585.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 28012499 is about 5292.6835348432. The cubic root of 28012499 is about 303.7040741869.

The spelling of 28012499 in words is "twenty-eight million, twelve thousand, four hundred ninety-nine".