72115643 has 2 divisors, whose sum is σ = 72115644. Its totient is φ = 72115642.

The previous prime is 72115639. The next prime is 72115661. The reversal of 72115643 is 34651127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72115643 - 2² = 72115639 is a prime.

It is not a weakly prime, because it can be changed into another prime (72115633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36057821 + 36057822.

It is an arithmetic number, because the mean of its divisors is an integer number (36057822).

Almost surely, 2^72115643 is an apocalyptic number.

72115643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72115643 is an equidigital number, since it uses as much as digits as its factorization.

72115643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 72115643 is about 8492.0929693451. The cubic root of 72115643 is about 416.2393742985.

The spelling of 72115643 in words is "seventy-two million, one hundred fifteen thousand, six hundred forty-three".