81007733 has 4 divisors (see below), whose sum is σ = 81044460. Its totient is φ = 80971008.

The previous prime is 81007727. The next prime is 81007739. The reversal of 81007733 is 33770018.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81007727) and next prime (81007739).

It can be written as a sum of positive squares in 2 ways, for example, as 52896529 + 28111204 = 7273^2 + 5302^2 .

It is a cyclic number.

It is not a de Polignac number, because 81007733 - 2²⁰ = 79959157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81007696 and 81007705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81007739) 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, 14828 + ... + 19541.

It is an arithmetic number, because the mean of its divisors is an integer number (20261115).

Almost surely, 2^81007733 is an apocalyptic number.

It is an amenable number.

81007733 is a deficient number, since it is larger than the sum of its proper divisors (36727).

81007733 is a wasteful number, since it uses less digits than its factorization.

81007733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36726.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 81007733 is about 9000.4296008580. The cubic root of 81007733 is about 432.6886396861.

The spelling of 81007733 in words is "eighty-one million, seven thousand, seven hundred thirty-three".