28201700018 has 6 divisors (see below), whose sum is σ = 42302906271. Its totient is φ = 14100731262.

The previous prime is 28201699997. The next prime is 28201700047. The reversal of 28201700018 is 81000710282.

It can be written as a sum of positive squares in only one way, i.e., 14100850009 + 14100850009 = 118747^2 + 118747^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118747.

It is a super-2 number, since 2×28201700018² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 178121 + ... + 296867.

Almost surely, 2^28201700018 is an apocalyptic number.

28201700018 is a deficient number, since it is larger than the sum of its proper divisors (14101206253).

28201700018 is an frugal number, since it uses more digits than its factorization.

28201700018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237496 (or 118749 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The spelling of 28201700018 in words is "twenty-eight billion, two hundred one million, seven hundred thousand, eighteen".