28025587923840 has 1280 divisors, whose sum is σ = 120130857000000. Its totient is φ = 6151031488512.

The previous prime is 28025587923833. The next prime is 28025587923887. The reversal of 28025587923840 is 4832978552082.

It is a happy number.

28025587923840 is a `hidden beast` number, since 2 + 8 + 0 + 2 + 5 + 587 + 9 + 2 + 3 + 8 + 40 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 217611786 + ... + 217740534.

Almost surely, 2^{28025587923840} is an apocalyptic number.

28025587923840 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 28025587923840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60065428500000).

28025587923840 is an abundant number, since it is smaller than the sum of its proper divisors (92105269076160).

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

28025587923840 is a wasteful number, since it uses less digits than its factorization.

28025587923840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128829 (or 128808 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 63.

The spelling of 28025587923840 in words is "twenty-eight trillion, twenty-five billion, five hundred eighty-seven million, nine hundred twenty-three thousand, eight hundred forty".