28424391 has 16 divisors (see below), whose sum is σ = 40405248. Its totient is φ = 17712000.

The previous prime is 28424387. The next prime is 28424393. The reversal of 28424391 is 19342482.

It is not a de Polignac number, because 28424391 - 2² = 28424387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28424393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5856 + ... + 9546.

It is an arithmetic number, because the mean of its divisors is an integer number (2525328).

Almost surely, 2^28424391 is an apocalyptic number.

28424391 is a deficient number, since it is larger than the sum of its proper divisors (11980857).

28424391 is a wasteful number, since it uses less digits than its factorization.

28424391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862.

The product of its digits is 13824, while the sum is 33.

The square root of 28424391 is about 5331.4529914461. The cubic root of 28424391 is about 305.1853786596.

The spelling of 28424391 in words is "twenty-eight million, four hundred twenty-four thousand, three hundred ninety-one".