28591939 has 2 divisors, whose sum is σ = 28591940. Its totient is φ = 28591938.

The previous prime is 28591919. The next prime is 28591949. The reversal of 28591939 is 93919582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28591939 - 2⁵ = 28591907 is a prime.

It is not a weakly prime, because it can be changed into another prime (28591919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14295969 + 14295970.

It is an arithmetic number, because the mean of its divisors is an integer number (14295970).

Almost surely, 2^28591939 is an apocalyptic number.

28591939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28591939 is an equidigital number, since it uses as much as digits as its factorization.

28591939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 46.

The square root of 28591939 is about 5347.1430689668. The cubic root of 28591939 is about 305.7838442412.

The spelling of 28591939 in words is "twenty-eight million, five hundred ninety-one thousand, nine hundred thirty-nine".