81207733 has 8 divisors (see below), whose sum is σ = 84883968. Its totient is φ = 77543664.

The previous prime is 81207719. The next prime is 81207739. The reversal of 81207733 is 33770218.

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 81207733 - 2¹⁷ = 81076661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81207695 and 81207704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81207739) 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, 12316 + ... + 17722.

It is an arithmetic number, because the mean of its divisors is an integer number (10610496).

Almost surely, 2^81207733 is an apocalyptic number.

It is an amenable number.

81207733 is a deficient number, since it is larger than the sum of its proper divisors (3676235).

81207733 is a wasteful number, since it uses less digits than its factorization.

81207733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 81207733 is about 9011.5333323469. The cubic root of 81207733 is about 433.0444353803.

The spelling of 81207733 in words is "eighty-one million, two hundred seven thousand, seven hundred thirty-three".