81432084 has 24 divisors (see below), whose sum is σ = 192613120. Its totient is φ = 26771904.

The previous prime is 81432083. The next prime is 81432103. The reversal of 81432084 is 48023418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81432083) 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, 45604 + ... + 47355.

Almost surely, 2^81432084 is an apocalyptic number.

It is an amenable number.

81432084 is an abundant number, since it is smaller than the sum of its proper divisors (111181036).

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

81432084 is a wasteful number, since it uses less digits than its factorization.

81432084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93039 (or 93037 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 81432084 is about 9023.9727393205. The cubic root of 81432084 is about 433.4428564713.

The spelling of 81432084 in words is "eighty-one million, four hundred thirty-two thousand, eighty-four".