81896242 has 12 divisors (see below), whose sum is σ = 130496490. Its totient is φ = 38539136.

The previous prime is 81896239. The next prime is 81896263. The reversal of 81896242 is 24269818.

It can be written as a sum of positive squares in 3 ways, for example, as 81703521 + 192721 = 9039^2 + 439^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81896195 and 81896204.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70267 + ... + 71422.

Almost surely, 2^81896242 is an apocalyptic number.

81896242 is a deficient number, since it is larger than the sum of its proper divisors (48600248).

81896242 is a wasteful number, since it uses less digits than its factorization.

81896242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141725 (or 141708 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 81896242 is about 9049.6542475390. The cubic root of 81896242 is about 434.2648294827.

The spelling of 81896242 in words is "eighty-one million, eight hundred ninety-six thousand, two hundred forty-two".