81733973 has 8 divisors (see below), whose sum is σ = 85537728. Its totient is φ = 77951104.

The previous prime is 81733969. The next prime is 81734017. The reversal of 81733973 is 37933718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81733973 - 2² = 81733969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81733973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81733933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3086 + ... + 13152.

It is an arithmetic number, because the mean of its divisors is an integer number (10692216).

Almost surely, 2^81733973 is an apocalyptic number.

It is an amenable number.

81733973 is a deficient number, since it is larger than the sum of its proper divisors (3803755).

81733973 is a wasteful number, since it uses less digits than its factorization.

81733973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10443.

The product of its digits is 95256, while the sum is 41.

The square root of 81733973 is about 9040.6843214438. The cubic root of 81733973 is about 433.9778227747.

The spelling of 81733973 in words is "eighty-one million, seven hundred thirty-three thousand, nine hundred seventy-three".