72081213 has 8 divisors (see below), whose sum is σ = 97543008. Its totient is φ = 47336784.

The previous prime is 72081203. The next prime is 72081253. The reversal of 72081213 is 31218027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72081213 - 2⁴ = 72081197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72081203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179106 + ... + 179507.

It is an arithmetic number, because the mean of its divisors is an integer number (12192876).

Almost surely, 2^72081213 is an apocalyptic number.

It is an amenable number.

72081213 is a deficient number, since it is larger than the sum of its proper divisors (25461795).

72081213 is a wasteful number, since it uses less digits than its factorization.

72081213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358683.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 72081213 is about 8490.0655474501. The cubic root of 72081213 is about 416.1731223622.

The spelling of 72081213 in words is "seventy-two million, eighty-one thousand, two hundred thirteen".