74326781 has 2 divisors, whose sum is σ = 74326782. Its totient is φ = 74326780.

The previous prime is 74326751. The next prime is 74326789. The reversal of 74326781 is 18762347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67798756 + 6528025 = 8234^2 + 2555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74326781 is a prime.

It is a super-2 number, since 2×74326781² = 11048940747643922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74326789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37163390 + 37163391.

It is an arithmetic number, because the mean of its divisors is an integer number (37163391).

Almost surely, 2^74326781 is an apocalyptic number.

It is an amenable number.

74326781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74326781 is an equidigital number, since it uses as much as digits as its factorization.

74326781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 74326781 is about 8621.2981041140. The cubic root of 74326781 is about 420.4507273865.

The spelling of 74326781 in words is "seventy-four million, three hundred twenty-six thousand, seven hundred eighty-one".