73668281 has 2 divisors, whose sum is σ = 73668282. Its totient is φ = 73668280.

The previous prime is 73668271. The next prime is 73668311. The reversal of 73668281 is 18286637.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70829056 + 2839225 = 8416^2 + 1685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73668281 is a prime.

It is a super-2 number, since 2×73668281² = 10854031250989922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73668271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36834140 + 36834141.

It is an arithmetic number, because the mean of its divisors is an integer number (36834141).

Almost surely, 2^73668281 is an apocalyptic number.

It is an amenable number.

73668281 is a deficient number, since it is larger than the sum of its proper divisors (1).

73668281 is an equidigital number, since it uses as much as digits as its factorization.

73668281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 73668281 is about 8583.0228358079. The cubic root of 73668281 is about 419.2053777529.

The spelling of 73668281 in words is "seventy-three million, six hundred sixty-eight thousand, two hundred eighty-one".