28696627989 has 24 divisors (see below), whose sum is σ = 42610381632. Its totient is φ = 18603224640.

The previous prime is 28696627909. The next prime is 28696628003. The reversal of 28696627989 is 98972669682.

It is a happy number.

It is not a de Polignac number, because 28696627989 - 2²⁰ = 28695579413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28696627909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 260947 + ... + 354240.

It is an arithmetic number, because the mean of its divisors is an integer number (1775432568).

Almost surely, 2^28696627989 is an apocalyptic number.

It is an amenable number.

28696627989 is a deficient number, since it is larger than the sum of its proper divisors (13913753643).

28696627989 is a wasteful number, since it uses less digits than its factorization.

28696627989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615337 (or 615334 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 72.

The spelling of 28696627989 in words is "twenty-eight billion, six hundred ninety-six million, six hundred twenty-seven thousand, nine hundred eighty-nine".