28707919 has 2 divisors, whose sum is σ = 28707920. Its totient is φ = 28707918.

The previous prime is 28707911. The next prime is 28707923. The reversal of 28707919 is 91970782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28707919 - 2³ = 28707911 is a prime.

It is a super-2 number, since 2×28707919² = 1648289226621122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28707911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14353959 + 14353960.

It is an arithmetic number, because the mean of its divisors is an integer number (14353960).

Almost surely, 2^28707919 is an apocalyptic number.

28707919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28707919 is an equidigital number, since it uses as much as digits as its factorization.

28707919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 28707919 is about 5357.9771369426. The cubic root of 28707919 is about 306.1967457588.

The spelling of 28707919 in words is "twenty-eight million, seven hundred seven thousand, nine hundred nineteen".