28551908897280 has 960 divisors, whose sum is σ = 107318512604160. Its totient is φ = 6995897745408.

The previous prime is 28551908897273. The next prime is 28551908897321. The reversal of 28551908897280 is 8279880915582.

28551908897280 is a `hidden beast` number, since 2 + 8 + 5 + 519 + 0 + 8 + 89 + 7 + 28 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 28551908897199 and 28551908897208.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1548946944 + ... + 1548965376.

It is an arithmetic number, because the mean of its divisors is an integer number (111790117296).

Almost surely, 2^{28551908897280} is an apocalyptic number.

28551908897280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28551908897280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53659256302080).

28551908897280 is an abundant number, since it is smaller than the sum of its proper divisors (78766603706880).

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

28551908897280 is a wasteful number, since it uses less digits than its factorization.

28551908897280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18601 (or 18582 counting only the distinct ones).

The product of its (nonzero) digits is 232243200, while the sum is 72.

The spelling of 28551908897280 in words is "twenty-eight trillion, five hundred fifty-one billion, nine hundred eight million, eight hundred ninety-seven thousand, two hundred eighty".