28724651 has 2 divisors, whose sum is σ = 28724652. Its totient is φ = 28724650.

The previous prime is 28724639. The next prime is 28724671. The reversal of 28724651 is 15642782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28724651 - 2²² = 24530347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28724621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362325 + 14362326.

It is an arithmetic number, because the mean of its divisors is an integer number (14362326).

Almost surely, 2^28724651 is an apocalyptic number.

28724651 is a deficient number, since it is larger than the sum of its proper divisors (1).

28724651 is an equidigital number, since it uses as much as digits as its factorization.

28724651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 28724651 is about 5359.5383196690. The cubic root of 28724651 is about 306.2562216701.

The spelling of 28724651 in words is "twenty-eight million, seven hundred twenty-four thousand, six hundred fifty-one".