74000081 has 2 divisors, whose sum is σ = 74000082. Its totient is φ = 74000080.

The previous prime is 74000077. The next prime is 74000089. The reversal of 74000081 is 18000047.

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., 62331025 + 11669056 = 7895^2 + 3416^2 .

It is a cyclic number.

It is not a de Polignac number, because 74000081 - 2² = 74000077 is a prime.

It is a super-2 number, since 2×74000081² = 10952023976013122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (74000089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37000040 + 37000041.

It is an arithmetic number, because the mean of its divisors is an integer number (37000041).

Almost surely, 2^74000081 is an apocalyptic number.

It is an amenable number.

74000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

74000081 is an equidigital number, since it uses as much as digits as its factorization.

74000081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 74000081 is about 8602.3299750707. The cubic root of 74000081 is about 419.8337985633.

The spelling of 74000081 in words is "seventy-four million, eighty-one", and thus it is an aban number.