72442481 has 2 divisors, whose sum is σ = 72442482. Its totient is φ = 72442480.

The previous prime is 72442471. The next prime is 72442511. The reversal of 72442481 is 18424427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59367025 + 13075456 = 7705^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 72442481 - 2⁶ = 72442417 is a prime.

It is a super-2 number, since 2×72442481² = 10495826106870722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72442471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36221240 + 36221241.

It is an arithmetic number, because the mean of its divisors is an integer number (36221241).

Almost surely, 2^72442481 is an apocalyptic number.

It is an amenable number.

72442481 is a deficient number, since it is larger than the sum of its proper divisors (1).

72442481 is an equidigital number, since it uses as much as digits as its factorization.

72442481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 32.

The square root of 72442481 is about 8511.3148807925. The cubic root of 72442481 is about 416.8672447265.

The spelling of 72442481 in words is "seventy-two million, four hundred forty-two thousand, four hundred eighty-one".