28161963687520 has 96 divisors (see below), whose sum is σ = 71655839644032. Its totient is φ = 10397493614592.

The previous prime is 28161963687511. The next prime is 28161963687581. The reversal of 28161963687520 is 2578636916182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27987049 + ... + 28975831.

It is an arithmetic number, because the mean of its divisors is an integer number (746414996292).

Almost surely, 2^{28161963687520} is an apocalyptic number.

28161963687520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28161963687520 is an abundant number, since it is smaller than the sum of its proper divisors (43493875956512).

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

28161963687520 is a wasteful number, since it uses less digits than its factorization.

28161963687520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002504 (or 1002496 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 28161963687520 in words is "twenty-eight trillion, one hundred sixty-one billion, nine hundred sixty-three million, six hundred eighty-seven thousand, five hundred twenty".