28739999 has 2 divisors, whose sum is σ = 28740000. Its totient is φ = 28739998.

The previous prime is 28739941. The next prime is 28740011. The reversal of 28739999 is 99993782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28739999 - 2⁸ = 28739743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

28739999 is a modest number, since divided by 9999 gives 2873 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28739929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14369999 + 14370000.

It is an arithmetic number, because the mean of its divisors is an integer number (14370000).

Almost surely, 2^28739999 is an apocalyptic number.

28739999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28739999 is an equidigital number, since it uses as much as digits as its factorization.

28739999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 56.

The square root of 28739999 is about 5360.9699682054. The cubic root of 28739999 is about 306.3107576802.

The spelling of 28739999 in words is "twenty-eight million, seven hundred thirty-nine thousand, nine hundred ninety-nine".