28908077811930 has 80 divisors (see below), whose sum is σ = 77735182389480. Its totient is φ = 7708367213568.

The previous prime is 28908077811929. The next prime is 28908077811931. The reversal of 28908077811930 is 3911877080982.

It is an interprime number because it is at equal distance from previous prime (28908077811929) and next prime (28908077811931).

It can be written as a sum of positive squares in 4 ways, for example, as 16822950293241 + 12085127518689 = 4101579^2 + 3476367^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28908077811931) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12839686 + ... + 14922254.

Almost surely, 2^{28908077811930} is an apocalyptic number.

28908077811930 is an abundant number, since it is smaller than the sum of its proper divisors (48827104577550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28908077811930 is a wasteful number, since it uses less digits than its factorization.

28908077811930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099725 (or 2099716 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The spelling of 28908077811930 in words is "twenty-eight trillion, nine hundred eight billion, seventy-seven million, eight hundred eleven thousand, nine hundred thirty".