28748491 has 8 divisors (see below), whose sum is σ = 29119104. Its totient is φ = 28380480.

The previous prime is 28748477. The next prime is 28748509. The reversal of 28748491 is 19484782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28748491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28745491) 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, 30081 + ... + 31021.

It is an arithmetic number, because the mean of its divisors is an integer number (3639888).

Almost surely, 2^28748491 is an apocalyptic number.

28748491 is a deficient number, since it is larger than the sum of its proper divisors (370613).

28748491 is a wasteful number, since it uses less digits than its factorization.

28748491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301.

The product of its digits is 129024, while the sum is 43.

The square root of 28748491 is about 5361.7619305598. The cubic root of 28748491 is about 306.3409239396.

The spelling of 28748491 in words is "twenty-eight million, seven hundred forty-eight thousand, four hundred ninety-one".