28225669155840 has 704 divisors, whose sum is σ = 111509901189120. Its totient is φ = 6723719331840.

The previous prime is 28225669155833. The next prime is 28225669155881. The reversal of 28225669155840 is 4855196652282.

28225669155840 is a `hidden beast` number, since 2 + 8 + 2 + 2 + 566 + 9 + 15 + 58 + 4 + 0 = 666.

It is a super-2 number, since 2×28225669155840² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55457397 + ... + 55964043.

Almost surely, 2^{28225669155840} is an apocalyptic number.

28225669155840 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 28225669155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55754950594560).

28225669155840 is an abundant number, since it is smaller than the sum of its proper divisors (83284232033280).

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

28225669155840 is a wasteful number, since it uses less digits than its factorization.

28225669155840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506725 (or 506701 counting only the distinct ones).

The product of its (nonzero) digits is 82944000, while the sum is 63.

The spelling of 28225669155840 in words is "twenty-eight trillion, two hundred twenty-five billion, six hundred sixty-nine million, one hundred fifty-five thousand, eight hundred forty".