28668915481 has 32 divisors (see below), whose sum is σ = 31790465280. Its totient is φ = 25741363200.

The previous prime is 28668915463. The next prime is 28668915493. The reversal of 28668915481 is 18451986682.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28668915481 - 2⁹ = 28668914969 is a prime.

It is a super-2 number, since 2×28668915481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28668915181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7608660 + ... + 7612426.

It is an arithmetic number, because the mean of its divisors is an integer number (993452040).

Almost surely, 2^28668915481 is an apocalyptic number.

It is an amenable number.

28668915481 is a deficient number, since it is larger than the sum of its proper divisors (3121549799).

28668915481 is a wasteful number, since it uses less digits than its factorization.

28668915481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065.

The product of its digits is 6635520, while the sum is 58.

The spelling of 28668915481 in words is "twenty-eight billion, six hundred sixty-eight million, nine hundred fifteen thousand, four hundred eighty-one".