28303688169 has 81 divisors (see below), whose sum is σ = 44531518941. Its totient is φ = 17987900040.

The previous prime is 28303688141. The next prime is 28303688173. The reversal of 28303688169 is 96188630382.

It is a happy number.

The square root of 28303688169 is 168237.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (81).

It is not a de Polignac number, because 28303688169 - 2²³ = 28295299561 is a prime.

It is a super-2 number, since 2×28303688169² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28303688269) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 422443074 + ... + 422443140.

Almost surely, 2^28303688169 is an apocalyptic number.

28303688169 is the 168237-th square number.

28303688169 is the 84119-th centered octagonal number.

It is an amenable number.

28303688169 is a deficient number, since it is larger than the sum of its proper divisors (16227830772).

28303688169 is an frugal number, since it uses more digits than its factorization.

28303688169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 28303688169 in words is "twenty-eight billion, three hundred three million, six hundred eighty-eight thousand, one hundred sixty-nine".