72335981 has 2 divisors, whose sum is σ = 72335982. Its totient is φ = 72335980.

The previous prime is 72335917. The next prime is 72336001. The reversal of 72335981 is 18953327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48080356 + 24255625 = 6934^2 + 4925^2 .

It is a cyclic number.

It is not a de Polignac number, because 72335981 - 2⁶ = 72335917 is a prime.

It is a super-2 number, since 2×72335981² = 10464988294464722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72335281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36167990 + 36167991.

It is an arithmetic number, because the mean of its divisors is an integer number (36167991).

Almost surely, 2^72335981 is an apocalyptic number.

It is an amenable number.

72335981 is a deficient number, since it is larger than the sum of its proper divisors (1).

72335981 is an equidigital number, since it uses as much as digits as its factorization.

72335981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 72335981 is about 8505.0562020483. The cubic root of 72335981 is about 416.6628612630.

The spelling of 72335981 in words is "seventy-two million, three hundred thirty-five thousand, nine hundred eighty-one".