28539967 has 2 divisors, whose sum is σ = 28539968. Its totient is φ = 28539966.

The previous prime is 28539949. The next prime is 28539989. The reversal of 28539967 is 76993582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28539967 - 2²³ = 20151359 is a prime.

It is a super-2 number, since 2×28539967² = 1629059432722178, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28539967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28539947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269983 + 14269984.

It is an arithmetic number, because the mean of its divisors is an integer number (14269984).

Almost surely, 2^28539967 is an apocalyptic number.

28539967 is a deficient number, since it is larger than the sum of its proper divisors (1).

28539967 is an equidigital number, since it uses as much as digits as its factorization.

28539967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 28539967 is about 5342.2810671098. The cubic root of 28539967 is about 305.5984558950.

The spelling of 28539967 in words is "twenty-eight million, five hundred thirty-nine thousand, nine hundred sixty-seven".