28578179809 has 2 divisors, whose sum is σ = 28578179810. Its totient is φ = 28578179808.

The previous prime is 28578179797. The next prime is 28578179821. The reversal of 28578179809 is 90897187582.

It is a balanced prime because it is at equal distance from previous prime (28578179797) and next prime (28578179821).

It can be written as a sum of positive squares in only one way, i.e., 23002272225 + 5575907584 = 151665^2 + 74672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28578179809 is a prime.

It is a super-2 number, since 2×28578179809² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28578179899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14289089904 + 14289089905.

It is an arithmetic number, because the mean of its divisors is an integer number (14289089905).

Almost surely, 2^28578179809 is an apocalyptic number.

It is an amenable number.

28578179809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578179809 is an equidigital number, since it uses as much as digits as its factorization.

28578179809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20321280, while the sum is 64.

The spelling of 28578179809 in words is "twenty-eight billion, five hundred seventy-eight million, one hundred seventy-nine thousand, eight hundred nine".