28061087538 has 16 divisors (see below), whose sum is σ = 61224191136. Its totient is φ = 8503359840.

The previous prime is 28061087491. The next prime is 28061087597. The reversal of 28061087538 is 83578016082.

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, 212583931 + ... + 212584062.

It is an arithmetic number, because the mean of its divisors is an integer number (3826511946).

Almost surely, 2^28061087538 is an apocalyptic number.

28061087538 is an abundant number, since it is smaller than the sum of its proper divisors (33163103598).

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

28061087538 is a wasteful number, since it uses less digits than its factorization.

28061087538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425168009.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 28061087538 in words is "twenty-eight billion, sixty-one million, eighty-seven thousand, five hundred thirty-eight".