81339484 has 6 divisors (see below), whose sum is σ = 142344104. Its totient is φ = 40669740.

The previous prime is 81339481. The next prime is 81339491. The reversal of 81339484 is 48493318.

It is a super-2 number, since 2×81339484² = 13232223314772512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81339481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10167432 + ... + 10167439.

Almost surely, 2^81339484 is an apocalyptic number.

It is an amenable number.

81339484 is a deficient number, since it is larger than the sum of its proper divisors (61004620).

81339484 is a wasteful number, since it uses less digits than its factorization.

81339484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20334875 (or 20334873 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 81339484 is about 9018.8405019714. The cubic root of 81339484 is about 433.2784985183.

The spelling of 81339484 in words is "eighty-one million, three hundred thirty-nine thousand, four hundred eighty-four".