28015823 has 8 divisors (see below), whose sum is σ = 32171520. Its totient is φ = 24128280.

The previous prime is 28015787. The next prime is 28015837. The reversal of 28015823 is 32851082.

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

It is a de Polignac number, because none of the positive numbers 2^k-28015823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28015843) 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, 66815 + ... + 67232.

It is an arithmetic number, because the mean of its divisors is an integer number (4021440).

Almost surely, 2^28015823 is an apocalyptic number.

28015823 is a deficient number, since it is larger than the sum of its proper divisors (4155697).

28015823 is a wasteful number, since it uses less digits than its factorization.

28015823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134077.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28015823 is about 5292.9975439254. The cubic root of 28015823 is about 303.7160863535.

The spelling of 28015823 in words is "twenty-eight million, fifteen thousand, eight hundred twenty-three".