72485681 has 2 divisors, whose sum is σ = 72485682. Its totient is φ = 72485680.

The previous prime is 72485641. The next prime is 72485711. The reversal of 72485681 is 18658427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61701025 + 10784656 = 7855^2 + 3284^2 .

It is an emirp because it is prime and its reverse (18658427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72485681 is a prime.

It is a super-5 number, since 5×72485681⁵ (a number of 41 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72485641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36242840 + 36242841.

It is an arithmetic number, because the mean of its divisors is an integer number (36242841).

Almost surely, 2^72485681 is an apocalyptic number.

It is an amenable number.

72485681 is a deficient number, since it is larger than the sum of its proper divisors (1).

72485681 is an equidigital number, since it uses as much as digits as its factorization.

72485681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 72485681 is about 8513.8523008095. The cubic root of 72485681 is about 416.9500924616.

The spelling of 72485681 in words is "seventy-two million, four hundred eighty-five thousand, six hundred eighty-one".