72327791 has 4 divisors (see below), whose sum is σ = 72350784. Its totient is φ = 72304800.

The previous prime is 72327757. The next prime is 72327799. The reversal of 72327791 is 19772327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19772327 = 31 ⋅637817.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72327791 is a prime.

It is a super-3 number, since 3×72327791³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72327799) 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, 5855 + ... + 13376.

It is an arithmetic number, because the mean of its divisors is an integer number (18087696).

Almost surely, 2^72327791 is an apocalyptic number.

72327791 is a deficient number, since it is larger than the sum of its proper divisors (22993).

72327791 is a wasteful number, since it uses less digits than its factorization.

72327791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22992.

The product of its digits is 37044, while the sum is 38.

The square root of 72327791 is about 8504.5747101193. The cubic root of 72327791 is about 416.6471355823.

The spelling of 72327791 in words is "seventy-two million, three hundred twenty-seven thousand, seven hundred ninety-one".