28013293 has 8 divisors (see below), whose sum is σ = 34925760. Its totient is φ = 21828480.

The previous prime is 28013261. The next prime is 28013311. The reversal of 28013293 is 39231082.

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

It is a cyclic number.

It is not a de Polignac number, because 28013293 - 2⁵ = 28013261 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 (28013233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181828 + ... + 181981.

It is an arithmetic number, because the mean of its divisors is an integer number (4365720).

Almost surely, 2^28013293 is an apocalyptic number.

It is an amenable number.

28013293 is a deficient number, since it is larger than the sum of its proper divisors (6912467).

28013293 is a wasteful number, since it uses less digits than its factorization.

28013293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363827.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28013293 is about 5292.7585435196. The cubic root of 28013293 is about 303.7069436055.

The spelling of 28013293 in words is "twenty-eight million, thirteen thousand, two hundred ninety-three".