72616191 has 4 divisors (see below), whose sum is σ = 96821592. Its totient is φ = 48410792.

The previous prime is 72616189. The next prime is 72616199. The reversal of 72616191 is 19161627.

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

It is a cyclic number.

It is not a de Polignac number, because 72616191 - 2¹ = 72616189 is a prime.

It is a super-2 number, since 2×72616191² = 10546222390696962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72616199) 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 3 ways as a sum of consecutive naturals, for example, 12102696 + ... + 12102701.

It is an arithmetic number, because the mean of its divisors is an integer number (24205398).

Almost surely, 2^72616191 is an apocalyptic number.

72616191 is a deficient number, since it is larger than the sum of its proper divisors (24205401).

72616191 is a wasteful number, since it uses less digits than its factorization.

72616191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24205400.

The product of its digits is 4536, while the sum is 33.

The square root of 72616191 is about 8521.5134219222. The cubic root of 72616191 is about 417.2001810759.

The spelling of 72616191 in words is "seventy-two million, six hundred sixteen thousand, one hundred ninety-one".