28724999 has 8 divisors (see below), whose sum is σ = 30031872. Its totient is φ = 27423000.

The previous prime is 28724981. The next prime is 28725029. The reversal of 28724999 is 99942782.

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 28724999 - 2²⁴ = 11947783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28724909) 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, 16442 + ... + 18104.

It is an arithmetic number, because the mean of its divisors is an integer number (3753984).

Almost surely, 2^28724999 is an apocalyptic number.

28724999 is a deficient number, since it is larger than the sum of its proper divisors (1306873).

28724999 is a wasteful number, since it uses less digits than its factorization.

28724999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437.

The product of its digits is 653184, while the sum is 50.

The square root of 28724999 is about 5359.5707850536. The cubic root of 28724999 is about 306.2574584328.

The spelling of 28724999 in words is "twenty-eight million, seven hundred twenty-four thousand, nine hundred ninety-nine".