28724699 has 2 divisors, whose sum is σ = 28724700. Its totient is φ = 28724698.

The previous prime is 28724687. The next prime is 28724701. The reversal of 28724699 is 99642782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28724699 - 2²⁴ = 11947483 is a prime.

Together with 28724701, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28724639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362349 + 14362350.

It is an arithmetic number, because the mean of its divisors is an integer number (14362350).

Almost surely, 2^28724699 is an apocalyptic number.

28724699 is a deficient number, since it is larger than the sum of its proper divisors (1).

28724699 is an equidigital number, since it uses as much as digits as its factorization.

28724699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 28724699 is about 5359.5427976647. The cubic root of 28724699 is about 306.2563922586.

The spelling of 28724699 in words is "twenty-eight million, seven hundred twenty-four thousand, six hundred ninety-nine".