72446861 has 2 divisors, whose sum is σ = 72446862. Its totient is φ = 72446860.

The previous prime is 72446837. The next prime is 72446893. The reversal of 72446861 is 16864427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54848836 + 17598025 = 7406^2 + 4195^2 .

It is an emirp because it is prime and its reverse (16864427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72446861 - 2⁶ = 72446797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72446821) 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 as a sum of consecutive naturals, namely, 36223430 + 36223431.

It is an arithmetic number, because the mean of its divisors is an integer number (36223431).

Almost surely, 2^72446861 is an apocalyptic number.

It is an amenable number.

72446861 is a deficient number, since it is larger than the sum of its proper divisors (1).

72446861 is an equidigital number, since it uses as much as digits as its factorization.

72446861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 72446861 is about 8511.5721814480. The cubic root of 72446861 is about 416.8756460665.

The spelling of 72446861 in words is "seventy-two million, four hundred forty-six thousand, eight hundred sixty-one".