72081722 has 4 divisors (see below), whose sum is σ = 108122586. Its totient is φ = 36040860.

The previous prime is 72081721. The next prime is 72081739. The reversal of 72081722 is 22718027.

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

It can be written as a sum of positive squares in only one way, i.e., 64947481 + 7134241 = 8059^2 + 2671^2 .

It is not an unprimeable number, because it can be changed into a prime (72081721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18020429 + ... + 18020432.

Almost surely, 2^72081722 is an apocalyptic number.

72081722 is a deficient number, since it is larger than the sum of its proper divisors (36040864).

72081722 is a wasteful number, since it uses less digits than its factorization.

72081722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36040863.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 72081722 is about 8490.0955236087. The cubic root of 72081722 is about 416.1741019593.

Adding to 72081722 its reverse (22718027), we get a palindrome (94799749).

The spelling of 72081722 in words is "seventy-two million, eighty-one thousand, seven hundred twenty-two".