28578179797 has 2 divisors, whose sum is σ = 28578179798. Its totient is φ = 28578179796.

The previous prime is 28578179789. The next prime is 28578179809. The reversal of 28578179797 is 79797187582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24034610961 + 4543568836 = 155031^2 + 67406^2 .

It is a cyclic number.

It is not a de Polignac number, because 28578179797 - 2³ = 28578179789 is a prime.

It is a super-2 number, since 2×28578179797² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28578179897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14289089898 + 14289089899.

It is an arithmetic number, because the mean of its divisors is an integer number (14289089899).

Almost surely, 2^28578179797 is an apocalyptic number.

It is an amenable number.

28578179797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578179797 is an equidigital number, since it uses as much as digits as its factorization.

28578179797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124467840, while the sum is 70.

The spelling of 28578179797 in words is "twenty-eight billion, five hundred seventy-eight million, one hundred seventy-nine thousand, seven hundred ninety-seven".