28197010845 has 80 divisors (see below), whose sum is σ = 52398382080. Its totient is φ = 14491353600.

The previous prime is 28197010841. The next prime is 28197010867. The reversal of 28197010845 is 54801079182.

It is not a de Polignac number, because 28197010845 - 2² = 28197010841 is a prime.

It is a super-2 number, since 2×28197010845² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28197010845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197010841) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3021096 + ... + 3030414.

It is an arithmetic number, because the mean of its divisors is an integer number (654979776).

Almost surely, 2^28197010845 is an apocalyptic number.

It is an amenable number.

28197010845 is a deficient number, since it is larger than the sum of its proper divisors (24201371235).

28197010845 is a wasteful number, since it uses less digits than its factorization.

28197010845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9608 (or 9599 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 28197010845 in words is "twenty-eight billion, one hundred ninety-seven million, ten thousand, eight hundred forty-five".