28668917625 has 16 divisors (see below), whose sum is σ = 47705079552. Its totient is φ = 15290089200.

The previous prime is 28668917611. The next prime is 28668917633. The reversal of 28668917625 is 52671986682.

It is not a de Polignac number, because 28668917625 - 2⁴ = 28668917609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38224849 + ... + 38225598.

It is an arithmetic number, because the mean of its divisors is an integer number (2981567472).

Almost surely, 2^28668917625 is an apocalyptic number.

28668917625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28668917625 is a deficient number, since it is larger than the sum of its proper divisors (19036161927).

28668917625 is an equidigital number, since it uses as much as digits as its factorization.

28668917625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76450465 (or 76450455 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 60.

The spelling of 28668917625 in words is "twenty-eight billion, six hundred sixty-eight million, nine hundred seventeen thousand, six hundred twenty-five".