72824861 has 2 divisors, whose sum is σ = 72824862. Its totient is φ = 72824860.

The previous prime is 72824839. The next prime is 72824951. The reversal of 72824861 is 16842827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52852900 + 19971961 = 7270^2 + 4469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72824861 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 (72824261) 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, 36412430 + 36412431.

It is an arithmetic number, because the mean of its divisors is an integer number (36412431).

Almost surely, 2^72824861 is an apocalyptic number.

It is an amenable number.

72824861 is a deficient number, since it is larger than the sum of its proper divisors (1).

72824861 is an equidigital number, since it uses as much as digits as its factorization.

72824861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 38.

The square root of 72824861 is about 8533.7483557930. The cubic root of 72824861 is about 417.5994212649.

The spelling of 72824861 in words is "seventy-two million, eight hundred twenty-four thousand, eight hundred sixty-one".