28154989632 has 448 divisors, whose sum is σ = 100076617728. Its totient is φ = 6766848000.

The previous prime is 28154989571. The next prime is 28154989633. The reversal of 28154989632 is 23698945182.

It is a tau number, because it is divible by the number of its divisors (448).

It is not an unprimeable number, because it can be changed into a prime (28154989633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10539657 + ... + 10542327.

Almost surely, 2^28154989632 is an apocalyptic number.

28154989632 is a gapful number since it is divisible by the number (22) 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 28154989632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50038308864).

28154989632 is an abundant number, since it is smaller than the sum of its proper divisors (71921628096).

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

28154989632 is a wasteful number, since it uses less digits than its factorization.

28154989632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758 (or 2748 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 57.

The spelling of 28154989632 in words is "twenty-eight billion, one hundred fifty-four million, nine hundred eighty-nine thousand, six hundred thirty-two".