74079781 has 2 divisors, whose sum is σ = 74079782. Its totient is φ = 74079780.

The previous prime is 74079713. The next prime is 74079791. The reversal of 74079781 is 18797047.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62964225 + 11115556 = 7935^2 + 3334^2 .

It is an emirp because it is prime and its reverse (18797047) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74079781 - 2¹⁷ = 73948709 is a prime.

It is a super-2 number, since 2×74079781² = 10975627906015922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74079701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37039890 + 37039891.

It is an arithmetic number, because the mean of its divisors is an integer number (37039891).

Almost surely, 2^74079781 is an apocalyptic number.

It is an amenable number.

74079781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74079781 is an equidigital number, since it uses as much as digits as its factorization.

74079781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 74079781 is about 8606.9611942892. The cubic root of 74079781 is about 419.9844684355.

The spelling of 74079781 in words is "seventy-four million, seventy-nine thousand, seven hundred eighty-one".