28285979437 has 2 divisors, whose sum is σ = 28285979438. Its totient is φ = 28285979436.

The previous prime is 28285979341. The next prime is 28285979443. The reversal of 28285979437 is 73497958282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15638502916 + 12647476521 = 125054^2 + 112461^2 .

It is a cyclic number.

It is not a de Polignac number, because 28285979437 - 2²³ = 28277590829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28285979237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14142989718 + 14142989719.

It is an arithmetic number, because the mean of its divisors is an integer number (14142989719).

Almost surely, 2^28285979437 is an apocalyptic number.

It is an amenable number.

28285979437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28285979437 is an equidigital number, since it uses as much as digits as its factorization.

28285979437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 64.

The spelling of 28285979437 in words is "twenty-eight billion, two hundred eighty-five million, nine hundred seventy-nine thousand, four hundred thirty-seven".