72181882 has 4 divisors (see below), whose sum is σ = 108272826. Its totient is φ = 36090940.

The previous prime is 72181873. The next prime is 72181883. The reversal of 72181882 is 28818127.

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., 65270241 + 6911641 = 8079^2 + 2629^2 .

It is not an unprimeable number, because it can be changed into a prime (72181883) 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, 18045469 + ... + 18045472.

Almost surely, 2^72181882 is an apocalyptic number.

72181882 is a deficient number, since it is larger than the sum of its proper divisors (36090944).

72181882 is a wasteful number, since it uses less digits than its factorization.

72181882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36090943.

The product of its digits is 14336, while the sum is 37.

The square root of 72181882 is about 8495.9921139323. The cubic root of 72181882 is about 416.3667754261.

The spelling of 72181882 in words is "seventy-two million, one hundred eighty-one thousand, eight hundred eighty-two".