28078601181 has 32 divisors (see below), whose sum is σ = 40154849280. Its totient is φ = 17406886464.

The previous prime is 28078601167. The next prime is 28078601203. The reversal of 28078601181 is 18110687082.

It is not a de Polignac number, because 28078601181 - 2³¹ = 25931117533 is a prime.

It is a super-2 number, since 2×28078601181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078601281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3669946 + ... + 3677588.

It is an arithmetic number, because the mean of its divisors is an integer number (1254839040).

Almost surely, 2^28078601181 is an apocalyptic number.

It is an amenable number.

28078601181 is a deficient number, since it is larger than the sum of its proper divisors (12076248099).

28078601181 is a wasteful number, since it uses less digits than its factorization.

28078601181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9145.

The product of its (nonzero) digits is 43008, while the sum is 42.

The spelling of 28078601181 in words is "twenty-eight billion, seventy-eight million, six hundred one thousand, one hundred eighty-one".