28063391 has 8 divisors (see below), whose sum is σ = 29042640. Its totient is φ = 27099072.

The previous prime is 28063369. The next prime is 28063411. The reversal of 28063391 is 19336082.

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 28063391 - 2⁶ = 28063327 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 (28063351) 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, 161 + ... + 7493.

It is an arithmetic number, because the mean of its divisors is an integer number (3630330).

Almost surely, 2^28063391 is an apocalyptic number.

28063391 is a deficient number, since it is larger than the sum of its proper divisors (979249).

28063391 is an equidigital number, since it uses as much as digits as its factorization.

28063391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7465.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 28063391 is about 5297.4891222163. The cubic root of 28063391 is about 303.8878821026.

The spelling of 28063391 in words is "twenty-eight million, sixty-three thousand, three hundred ninety-one".