28081658442 has 16 divisors (see below), whose sum is σ = 56688208992. Its totient is φ = 9273070800.

The previous prime is 28081658413. The next prime is 28081658497. The reversal of 28081658442 is 24485618082.

It is a junction number, because it is equal to n+sod(n) for n = 28081658391 and 28081658400.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21869809 + ... + 21871092.

It is an arithmetic number, because the mean of its divisors is an integer number (3543013062).

Almost surely, 2^28081658442 is an apocalyptic number.

28081658442 is an abundant number, since it is smaller than the sum of its proper divisors (28606550550).

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

28081658442 is a wasteful number, since it uses less digits than its factorization.

28081658442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43741013.

The product of its (nonzero) digits is 983040, while the sum is 48.

The spelling of 28081658442 in words is "twenty-eight billion, eighty-one million, six hundred fifty-eight thousand, four hundred forty-two".