72156791 has 8 divisors (see below), whose sum is σ = 82521504. Its totient is φ = 61806240.

The previous prime is 72156787. The next prime is 72156827. The reversal of 72156791 is 19765127.

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

It is a cyclic number.

It is not a de Polignac number, because 72156791 - 2² = 72156787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72156391) 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 in 7 ways as a sum of consecutive naturals, for example, 11861 + ... + 16881.

It is an arithmetic number, because the mean of its divisors is an integer number (10315188).

Almost surely, 2^72156791 is an apocalyptic number.

72156791 is a deficient number, since it is larger than the sum of its proper divisors (10364713).

72156791 is a wasteful number, since it uses less digits than its factorization.

72156791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7081.

The product of its digits is 26460, while the sum is 38.

The square root of 72156791 is about 8494.5153481526. The cubic root of 72156791 is about 416.3185256937.

The spelling of 72156791 in words is "seventy-two million, one hundred fifty-six thousand, seven hundred ninety-one".