74908781 has 2 divisors, whose sum is σ = 74908782. Its totient is φ = 74908780.

The previous prime is 74908777. The next prime is 74908807. The reversal of 74908781 is 18780947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55636681 + 19272100 = 7459^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 74908781 - 2² = 74908777 is a prime.

It is a super-2 number, since 2×74908781² = 11222650941811922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74908721) 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, 37454390 + 37454391.

It is an arithmetic number, because the mean of its divisors is an integer number (37454391).

Almost surely, 2^74908781 is an apocalyptic number.

It is an amenable number.

74908781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74908781 is an equidigital number, since it uses as much as digits as its factorization.

74908781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 74908781 is about 8654.9859040902. The cubic root of 74908781 is about 421.5452919908.

The spelling of 74908781 in words is "seventy-four million, nine hundred eight thousand, seven hundred eighty-one".