81632733 has 32 divisors (see below), whose sum is σ = 135991296. Its totient is φ = 42406848.

The previous prime is 81632729. The next prime is 81632737. The reversal of 81632733 is 33723618.

It is an interprime number because it is at equal distance from previous prime (81632729) and next prime (81632737).

It is not a de Polignac number, because 81632733 - 2² = 81632729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81632694 and 81632703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81632737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16060 + ... + 20522.

It is an arithmetic number, because the mean of its divisors is an integer number (4249728).

Almost surely, 2^81632733 is an apocalyptic number.

It is an amenable number.

81632733 is a deficient number, since it is larger than the sum of its proper divisors (54358563).

81632733 is a wasteful number, since it uses less digits than its factorization.

81632733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553.

The product of its digits is 18144, while the sum is 33.

The square root of 81632733 is about 9035.0834528520. The cubic root of 81632733 is about 433.7985661527.

The spelling of 81632733 in words is "eighty-one million, six hundred thirty-two thousand, seven hundred thirty-three".