28997973666736 has 20 divisors (see below), whose sum is σ = 56254963551352. Its totient is φ = 14480563718016.

The previous prime is 28997973666721. The next prime is 28997973666743. The reversal of 28997973666736 is 63766637979982.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151431725 + ... + 1151456908.

Almost surely, 2^{28997973666736} is an apocalyptic number.

It is an amenable number.

28997973666736 is a deficient number, since it is larger than the sum of its proper divisors (27256989884616).

28997973666736 is a wasteful number, since it uses less digits than its factorization.

28997973666736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302889428 (or 2302889422 counting only the distinct ones).

The product of its digits is 46664771328, while the sum is 88.

The spelling of 28997973666736 in words is "twenty-eight trillion, nine hundred ninety-seven billion, nine hundred seventy-three million, six hundred sixty-six thousand, seven hundred thirty-six".