28691935137 has 12 divisors (see below), whose sum is σ = 41452354944. Its totient is φ = 19124057400.

The previous prime is 28691935133. The next prime is 28691935163. The reversal of 28691935137 is 73153919682.

28691935137 is a `hidden beast` number, since 286 + 9 + 1 + 9 + 351 + 3 + 7 = 666.

It is not a de Polignac number, because 28691935137 - 2² = 28691935133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28691935133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277989 + ... + 366962.

It is an arithmetic number, because the mean of its divisors is an integer number (3454362912).

Almost surely, 2^28691935137 is an apocalyptic number.

It is an amenable number.

28691935137 is a deficient number, since it is larger than the sum of its proper divisors (12760419807).

28691935137 is a wasteful number, since it uses less digits than its factorization.

28691935137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649900 (or 649897 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 28691935137 in words is "twenty-eight billion, six hundred ninety-one million, nine hundred thirty-five thousand, one hundred thirty-seven".