28949815 has 8 divisors (see below), whose sum is σ = 35860608. Its totient is φ = 22412640.

The previous prime is 28949779. The next prime is 28949857. The reversal of 28949815 is 51894982.

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

It is not a de Polignac number, because 28949815 - 2⁹ = 28949303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 93232 + ... + 93541.

It is an arithmetic number, because the mean of its divisors is an integer number (4482576).

Almost surely, 2^28949815 is an apocalyptic number.

28949815 is a deficient number, since it is larger than the sum of its proper divisors (6910793).

28949815 is a wasteful number, since it uses less digits than its factorization.

28949815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186809.

The product of its digits is 207360, while the sum is 46.

The square root of 28949815 is about 5380.5032292528. The cubic root of 28949815 is about 307.0543569996.

The spelling of 28949815 in words is "twenty-eight million, nine hundred forty-nine thousand, eight hundred fifteen".