28297699 has 4 divisors (see below), whose sum is σ = 29210560. Its totient is φ = 27384840.

The previous prime is 28297697. The next prime is 28297723. The reversal of 28297699 is 99679282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28297699 - 2¹ = 28297697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28297693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456384 + ... + 456445.

It is an arithmetic number, because the mean of its divisors is an integer number (7302640).

Almost surely, 2^28297699 is an apocalyptic number.

28297699 is a deficient number, since it is larger than the sum of its proper divisors (912861).

28297699 is an equidigital number, since it uses as much as digits as its factorization.

28297699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912860.

The product of its digits is 979776, while the sum is 52.

The square root of 28297699 is about 5319.5581583436. The cubic root of 28297699 is about 304.7312835209.

The spelling of 28297699 in words is "twenty-eight million, two hundred ninety-seven thousand, six hundred ninety-nine".