28997615 has 8 divisors (see below), whose sum is σ = 35387280. Its totient is φ = 22804672.

The previous prime is 28997581. The next prime is 28997623. The reversal of 28997615 is 51679982.

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-28997615 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28997615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48854 + ... + 49443.

It is an arithmetic number, because the mean of its divisors is an integer number (4423410).

Almost surely, 2^28997615 is an apocalyptic number.

28997615 is a deficient number, since it is larger than the sum of its proper divisors (6389665).

28997615 is an equidigital number, since it uses as much as digits as its factorization.

28997615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98361.

The product of its digits is 272160, while the sum is 47.

The square root of 28997615 is about 5384.9433608906. The cubic root of 28997615 is about 307.2232599519.

The spelling of 28997615 in words is "twenty-eight million, nine hundred ninety-seven thousand, six hundred fifteen".