81072633 has 4 divisors (see below), whose sum is σ = 108096848. Its totient is φ = 54048420.

The previous prime is 81072617. The next prime is 81072647. The reversal of 81072633 is 33627018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81072633 - 2⁴ = 81072617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81072633.

It is not an unprimeable number, because it can be changed into a prime (81072653) 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, 13512103 + ... + 13512108.

It is an arithmetic number, because the mean of its divisors is an integer number (27024212).

Almost surely, 2^81072633 is an apocalyptic number.

It is an amenable number.

81072633 is a deficient number, since it is larger than the sum of its proper divisors (27024215).

81072633 is a wasteful number, since it uses less digits than its factorization.

81072633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27024214.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 81072633 is about 9004.0342624848. The cubic root of 81072633 is about 432.8041595086.

The spelling of 81072633 in words is "eighty-one million, seventy-two thousand, six hundred thirty-three".