28081643742 has 24 divisors (see below), whose sum is σ = 60850442016. Its totient is φ = 9359489376.

The previous prime is 28081643741. The next prime is 28081643753. The reversal of 28081643742 is 24734618082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081643741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84523 + ... + 251609.

It is an arithmetic number, because the mean of its divisors is an integer number (2535435084).

Almost surely, 2^28081643742 is an apocalyptic number.

28081643742 is an abundant number, since it is smaller than the sum of its proper divisors (32768798274).

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

28081643742 is a wasteful number, since it uses less digits than its factorization.

28081643742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176432 (or 176429 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 28081643742 in words is "twenty-eight billion, eighty-one million, six hundred forty-three thousand, seven hundred forty-two".