81333956 has 24 divisors (see below), whose sum is σ = 160285440. Its totient is φ = 35776800.

The previous prime is 81333949. The next prime is 81333961. The reversal of 81333956 is 65933318.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28451 + ... + 31178.

It is an arithmetic number, because the mean of its divisors is an integer number (6678560).

Almost surely, 2^81333956 is an apocalyptic number.

It is an amenable number.

81333956 is a deficient number, since it is larger than the sum of its proper divisors (78951484).

81333956 is a wasteful number, since it uses less digits than its factorization.

81333956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59675 (or 59673 counting only the distinct ones).

The product of its digits is 58320, while the sum is 38.

The square root of 81333956 is about 9018.5340272131. The cubic root of 81333956 is about 433.2686827942.

The spelling of 81333956 in words is "eighty-one million, three hundred thirty-three thousand, nine hundred fifty-six".