81234642 has 16 divisors (see below), whose sum is σ = 162584352. Its totient is φ = 27059040.

The previous prime is 81234641. The next prime is 81234667. The reversal of 81234642 is 24643218.

It is not an unprimeable number, because it can be changed into a prime (81234641) 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, 6393 + ... + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (10161522).

Almost surely, 2^81234642 is an apocalyptic number.

81234642 is an abundant number, since it is smaller than the sum of its proper divisors (81349710).

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

81234642 is a wasteful number, since it uses less digits than its factorization.

81234642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9593.

The product of its digits is 9216, while the sum is 30.

The square root of 81234642 is about 9013.0262398375. The cubic root of 81234642 is about 433.0922613094.

The spelling of 81234642 in words is "eighty-one million, two hundred thirty-four thousand, six hundred forty-two".