72805433 has 4 divisors (see below), whose sum is σ = 72989220. Its totient is φ = 72621648.

The previous prime is 72805409. The next prime is 72805451. The reversal of 72805433 is 33450827.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29073664 + 43731769 = 5392^2 + 6613^2 .

It is a cyclic number.

It is not a de Polignac number, because 72805433 - 2⁸ = 72805177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72805433.

It is not an unprimeable number, because it can be changed into a prime (72807433) 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, 91298 + ... + 92091.

It is an arithmetic number, because the mean of its divisors is an integer number (18247305).

Almost surely, 2^72805433 is an apocalyptic number.

It is an amenable number.

72805433 is a deficient number, since it is larger than the sum of its proper divisors (183787).

72805433 is a wasteful number, since it uses less digits than its factorization.

72805433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183786.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 72805433 is about 8532.6099758515. The cubic root of 72805433 is about 417.5622826513.

The spelling of 72805433 in words is "seventy-two million, eight hundred five thousand, four hundred thirty-three".