28722499 has 16 divisors (see below), whose sum is σ = 32699520. Its totient is φ = 25038720.

The previous prime is 28722479. The next prime is 28722517. The reversal of 28722499 is 99422782.

It is a cyclic number.

It is not a de Polignac number, because 28722499 - 2⁷ = 28722371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28722479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16909 + ... + 18529.

It is an arithmetic number, because the mean of its divisors is an integer number (2043720).

Almost surely, 2^28722499 is an apocalyptic number.

28722499 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28722499 is a deficient number, since it is larger than the sum of its proper divisors (3977021).

28722499 is a wasteful number, since it uses less digits than its factorization.

28722499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710.

The product of its digits is 145152, while the sum is 43.

The square root of 28722499 is about 5359.3375523473. The cubic root of 28722499 is about 306.2485734211.

The spelling of 28722499 in words is "twenty-eight million, seven hundred twenty-two thousand, four hundred ninety-nine".