28835391 has 8 divisors (see below), whose sum is σ = 41404720. Its totient is φ = 17744832.

The previous prime is 28835357. The next prime is 28835431. The reversal of 28835391 is 19353882.

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

It is not a de Polignac number, because 28835391 - 2⁷ = 28835263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 739369 = 28835391 / (2 + 8 + 8 + 3 + 5 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28835311) 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, 369646 + ... + 369723.

It is an arithmetic number, because the mean of its divisors is an integer number (5175590).

Almost surely, 2^28835391 is an apocalyptic number.

28835391 is a deficient number, since it is larger than the sum of its proper divisors (12569329).

28835391 is a wasteful number, since it uses less digits than its factorization.

28835391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739385.

The product of its digits is 51840, while the sum is 39.

The square root of 28835391 is about 5369.8594953686. The cubic root of 28835391 is about 306.6492792337.

The spelling of 28835391 in words is "twenty-eight million, eight hundred thirty-five thousand, three hundred ninety-one".