74980781 has 2 divisors, whose sum is σ = 74980782. Its totient is φ = 74980780.

The previous prime is 74980739. The next prime is 74980813. The reversal of 74980781 is 18708947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74978281 + 2500 = 8659^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 74980781 - 2²⁶ = 7871917 is a prime.

It is a super-2 number, since 2×74980781² = 11244235038739922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74980721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37490390 + 37490391.

It is an arithmetic number, because the mean of its divisors is an integer number (37490391).

Almost surely, 2^74980781 is an apocalyptic number.

It is an amenable number.

74980781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74980781 is an equidigital number, since it uses as much as digits as its factorization.

74980781 is an evil number, because the sum of its binary digits is even.

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

The square root of 74980781 is about 8659.1443572676. The cubic root of 74980781 is about 421.6803075015.

The spelling of 74980781 in words is "seventy-four million, nine hundred eighty thousand, seven hundred eighty-one".