81346742432 has 48 divisors (see below), whose sum is σ = 170552452392. Its totient is φ = 38059499520.

The previous prime is 81346742431. The next prime is 81346742461. The reversal of 81346742432 is 23424764318.

It can be written as a sum of positive squares in 4 ways, for example, as 80449380496 + 897361936 = 283636^2 + 29956^2 .

It is not an unprimeable number, because it can be changed into a prime (81346742431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338069 + ... + 526292.

Almost surely, 2^81346742432 is an apocalyptic number.

It is an amenable number.

81346742432 is an abundant number, since it is smaller than the sum of its proper divisors (89205709960).

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

81346742432 is a wasteful number, since it uses less digits than its factorization.

81346742432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864561 (or 864553 counting only the distinct ones).

The product of its digits is 774144, while the sum is 44.

The spelling of 81346742432 in words is "eighty-one billion, three hundred forty-six million, seven hundred forty-two thousand, four hundred thirty-two".