28108661724 has 288 divisors, whose sum is σ = 86306508288. Its totient is φ = 7600320000.

The previous prime is 28108661723. The next prime is 28108661743. The reversal of 28108661724 is 42716680182.

28108661724 is a `hidden beast` number, since 2 + 8 + 1 + 0 + 8 + 6 + 617 + 24 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 28108661724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28108661723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19371199 + ... + 19372649.

It is an arithmetic number, because the mean of its divisors is an integer number (299675376).

Almost surely, 2^28108661724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28108661724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43153254144).

28108661724 is an abundant number, since it is smaller than the sum of its proper divisors (58197846564).

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

28108661724 is a wasteful number, since it uses less digits than its factorization.

28108661724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 28108661724 in words is "twenty-eight billion, one hundred eight million, six hundred sixty-one thousand, seven hundred twenty-four".