81733772 has 6 divisors (see below), whose sum is σ = 143034108. Its totient is φ = 40866884.

The previous prime is 81733753. The next prime is 81733811. The reversal of 81733772 is 27733718.

It is a plaindrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216718 + ... + 10216725.

It is an arithmetic number, because the mean of its divisors is an integer number (23839018).

Almost surely, 2^81733772 is an apocalyptic number.

It is an amenable number.

81733772 is a deficient number, since it is larger than the sum of its proper divisors (61300336).

81733772 is a wasteful number, since it uses less digits than its factorization.

81733772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20433447 (or 20433445 counting only the distinct ones).

The product of its digits is 49392, while the sum is 38.

The square root of 81733772 is about 9040.6732050218. The cubic root of 81733772 is about 433.9774670286.

The spelling of 81733772 in words is "eighty-one million, seven hundred thirty-three thousand, seven hundred seventy-two".