81087733432 has 8 divisors (see below), whose sum is σ = 152039500200. Its totient is φ = 40543866712.

The previous prime is 81087733409. The next prime is 81087733451. The reversal of 81087733432 is 23433778018.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5067983332 + ... + 5067983347.

It is an arithmetic number, because the mean of its divisors is an integer number (19004937525).

Almost surely, 2^81087733432 is an apocalyptic number.

It is an amenable number.

81087733432 is a deficient number, since it is larger than the sum of its proper divisors (70951766768).

81087733432 is a wasteful number, since it uses less digits than its factorization.

81087733432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10135966685 (or 10135966681 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 46.

The spelling of 81087733432 in words is "eighty-one billion, eighty-seven million, seven hundred thirty-three thousand, four hundred thirty-two".