28890491 has 8 divisors (see below), whose sum is σ = 33073920. Its totient is φ = 24721128.

The previous prime is 28890487. The next prime is 28890493. The reversal of 28890491 is 19409882.

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 28890491 - 2² = 28890487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28890493) 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, 1340 + ... + 7718.

It is an arithmetic number, because the mean of its divisors is an integer number (4134240).

Almost surely, 2^28890491 is an apocalyptic number.

28890491 is a deficient number, since it is larger than the sum of its proper divisors (4183429).

28890491 is an equidigital number, since it uses as much as digits as its factorization.

28890491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7033.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 28890491 is about 5374.9875348693. The cubic root of 28890491 is about 306.8444748363.

The spelling of 28890491 in words is "twenty-eight million, eight hundred ninety thousand, four hundred ninety-one".