28857790181 has 8 divisors (see below), whose sum is σ = 32249060928. Its totient is φ = 25594492000.

The previous prime is 28857790151. The next prime is 28857790193. The reversal of 28857790181 is 18109775882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28857790181 is a prime.

It is a super-2 number, since 2×28857790181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28857790151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31992665 + ... + 31993566.

It is an arithmetic number, because the mean of its divisors is an integer number (4031132616).

Almost surely, 2^28857790181 is an apocalyptic number.

It is an amenable number.

28857790181 is a deficient number, since it is larger than the sum of its proper divisors (3391270747).

28857790181 is a wasteful number, since it uses less digits than its factorization.

28857790181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63986283.

The product of its (nonzero) digits is 2257920, while the sum is 56.

The spelling of 28857790181 in words is "twenty-eight billion, eight hundred fifty-seven million, seven hundred ninety thousand, one hundred eighty-one".