28297493 has 8 divisors (see below), whose sum is σ = 32382912. Its totient is φ = 24222816.

The previous prime is 28297463. The next prime is 28297559. The reversal of 28297493 is 39479282.

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 28297493 - 2⁸ = 28297237 is a prime.

It is a super-2 number, since 2×28297493² = 1601496220170098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28297433) 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, 4121 + ... + 8577.

It is an arithmetic number, because the mean of its divisors is an integer number (4047864).

Almost surely, 2^28297493 is an apocalyptic number.

It is an amenable number.

28297493 is a deficient number, since it is larger than the sum of its proper divisors (4085419).

28297493 is an equidigital number, since it uses as much as digits as its factorization.

28297493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5371.

The product of its digits is 217728, while the sum is 44.

The square root of 28297493 is about 5319.5387957980. The cubic root of 28297493 is about 304.7305440638.

The spelling of 28297493 in words is "twenty-eight million, two hundred ninety-seven thousand, four hundred ninety-three".