28091616354 has 48 divisors (see below), whose sum is σ = 63066739320. Its totient is φ = 9026223360.

The previous prime is 28091616331. The next prime is 28091616373. The reversal of 28091616354 is 45361619082.

28091616354 is a `hidden beast` number, since 2 + 8 + 0 + 9 + 1 + 6 + 1 + 635 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 24924515625 + 3167100729 = 157875^2 + 56277^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 278464 + ... + 365684.

Almost surely, 2^28091616354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28091616354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31533369660).

28091616354 is an abundant number, since it is smaller than the sum of its proper divisors (34975122966).

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

28091616354 is a wasteful number, since it uses less digits than its factorization.

28091616354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87875 (or 87872 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 28091616354 in words is "twenty-eight billion, ninety-one million, six hundred sixteen thousand, three hundred fifty-four".