81742136 has 16 divisors (see below), whose sum is σ = 175161840. Its totient is φ = 35032320.

The previous prime is 81742121. The next prime is 81742163. The reversal of 81742136 is 63124718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729785 + ... + 729896.

It is an arithmetic number, because the mean of its divisors is an integer number (10947615).

Almost surely, 2^81742136 is an apocalyptic number.

It is an amenable number.

81742136 is an abundant number, since it is smaller than the sum of its proper divisors (93419704).

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

81742136 is a wasteful number, since it uses less digits than its factorization.

81742136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459694 (or 1459690 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 81742136 is about 9041.1357693600. The cubic root of 81742136 is about 433.9922698192.

The spelling of 81742136 in words is "eighty-one million, seven hundred forty-two thousand, one hundred thirty-six".