28081803654 has 96 divisors (see below), whose sum is σ = 68561525760. Its totient is φ = 8581788000.

The previous prime is 28081803647. The next prime is 28081803677. The reversal of 28081803654 is 45630818082.

28081803654 is a `hidden beast` number, since 280 + 8 + 1 + 8 + 0 + 365 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 237204 + ... + 335304.

It is an arithmetic number, because the mean of its divisors is an integer number (714182560).

Almost surely, 2^28081803654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28081803654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34280762880).

28081803654 is an abundant number, since it is smaller than the sum of its proper divisors (40479722106).

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

28081803654 is a wasteful number, since it uses less digits than its factorization.

28081803654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98168 (or 98156 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 28081803654 in words is "twenty-eight billion, eighty-one million, eight hundred three thousand, six hundred fifty-four".