72665843 has 2 divisors, whose sum is σ = 72665844. Its totient is φ = 72665842.

The previous prime is 72665839. The next prime is 72665867. The reversal of 72665843 is 34856627.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72665843 - 2² = 72665839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72665843.

It is not a weakly prime, because it can be changed into another prime (72665833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36332921 + 36332922.

It is an arithmetic number, because the mean of its divisors is an integer number (36332922).

Almost surely, 2^72665843 is an apocalyptic number.

72665843 is a deficient number, since it is larger than the sum of its proper divisors (1).

72665843 is an equidigital number, since it uses as much as digits as its factorization.

72665843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 72665843 is about 8524.4262563530. The cubic root of 72665843 is about 417.2952475874.

The spelling of 72665843 in words is "seventy-two million, six hundred sixty-five thousand, eight hundred forty-three".