28498991 has 8 divisors (see below), whose sum is σ = 29366400. Its totient is φ = 27636768.

The previous prime is 28498979. The next prime is 28498999. The reversal of 28498991 is 19989482.

It is a happy number.

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 28498991 - 2¹⁴ = 28482607 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 (28498999) 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, 11810 + ... + 14016.

It is an arithmetic number, because the mean of its divisors is an integer number (3670800).

Almost surely, 2^28498991 is an apocalyptic number.

28498991 is a deficient number, since it is larger than the sum of its proper divisors (867409).

28498991 is a wasteful number, since it uses less digits than its factorization.

28498991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593.

The product of its digits is 373248, while the sum is 50.

The square root of 28498991 is about 5338.4446236708. Note that the first 3 decimals coincide. The cubic root of 28498991 is about 305.4521324370.

The spelling of 28498991 in words is "twenty-eight million, four hundred ninety-eight thousand, nine hundred ninety-one".