28365919 has 2 divisors, whose sum is σ = 28365920. Its totient is φ = 28365918.

The previous prime is 28365913. The next prime is 28365929. The reversal of 28365919 is 91956382.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28365919 - 2¹³ = 28357727 is a prime.

It is a super-2 number, since 2×28365919² = 1609250721429122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28365913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14182959 + 14182960.

It is an arithmetic number, because the mean of its divisors is an integer number (14182960).

Almost surely, 2^28365919 is an apocalyptic number.

28365919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28365919 is an equidigital number, since it uses as much as digits as its factorization.

28365919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 28365919 is about 5325.9664850617. The cubic root of 28365919 is about 304.9759687238.

The spelling of 28365919 in words is "twenty-eight million, three hundred sixty-five thousand, nine hundred nineteen".