28751399 has 2 divisors, whose sum is σ = 28751400. Its totient is φ = 28751398.

The previous prime is 28751347. The next prime is 28751417. The reversal of 28751399 is 99315782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28751399 - 2¹⁶ = 28685863 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28751309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14375699 + 14375700.

It is an arithmetic number, because the mean of its divisors is an integer number (14375700).

Almost surely, 2^28751399 is an apocalyptic number.

28751399 is a deficient number, since it is larger than the sum of its proper divisors (1).

28751399 is an equidigital number, since it uses as much as digits as its factorization.

28751399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 28751399 is about 5362.0331032175. The cubic root of 28751399 is about 306.3512527063.

The spelling of 28751399 in words is "twenty-eight million, seven hundred fifty-one thousand, three hundred ninety-nine".