28257739689280 has 56 divisors (see below), whose sum is σ = 68853597148512. Its totient is φ = 11040233175552.

The previous prime is 28257739689253. The next prime is 28257739689313. The reversal of 28257739689280 is 8298693775282.

It is a super-2 number, since 2×28257739689280² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28257739689197 and 28257739689206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026793642 + ... + 1026821161.

Almost surely, 2^{28257739689280} is an apocalyptic number.

28257739689280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28257739689280 is an abundant number, since it is smaller than the sum of its proper divisors (40595857459232).

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

28257739689280 is a wasteful number, since it uses less digits than its factorization.

28257739689280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053614863 (or 2053614853 counting only the distinct ones).

The product of its (nonzero) digits is 1463132160, while the sum is 76.

The spelling of 28257739689280 in words is "twenty-eight trillion, two hundred fifty-seven billion, seven hundred thirty-nine million, six hundred eighty-nine thousand, two hundred eighty".