81033072 has 20 divisors (see below), whose sum is σ = 209335560. Its totient is φ = 27011008.

The previous prime is 81033059. The next prime is 81033077. The reversal of 81033072 is 27033018.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81033077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844047 + ... + 844142.

It is an arithmetic number, because the mean of its divisors is an integer number (10466778).

Almost surely, 2^81033072 is an apocalyptic number.

It is an amenable number.

81033072 is an abundant number, since it is smaller than the sum of its proper divisors (128302488).

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

81033072 is a wasteful number, since it uses less digits than its factorization.

81033072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688200 (or 1688194 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 81033072 is about 9001.8371458275. The cubic root of 81033072 is about 432.7337495954.

It can be divided in two parts, 8103 and 3072, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 81033072 in words is "eighty-one million, thirty-three thousand, seventy-two".