28997571890280 has 128 divisors (see below), whose sum is σ = 99442595911680. Its totient is φ = 6626526470400.

The previous prime is 28997571890279. The next prime is 28997571890317. The reversal of 28997571890280 is 8209817579982.

It is a hoax number, since the sum of its digits (75) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139044 + ... + 7616723.

It is an arithmetic number, because the mean of its divisors is an integer number (776895280560).

Almost surely, 2^{28997571890280} is an apocalyptic number.

28997571890280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28997571890280 is an abundant number, since it is smaller than the sum of its proper divisors (70445024021400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28997571890280 is a wasteful number, since it uses less digits than its factorization.

28997571890280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7760239 (or 7760235 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 75.

The spelling of 28997571890280 in words is "twenty-eight trillion, nine hundred ninety-seven billion, five hundred seventy-one million, eight hundred ninety thousand, two hundred eighty".