74745817 has 2 divisors, whose sum is σ = 74745818. Its totient is φ = 74745816.

The previous prime is 74745799. The next prime is 74745823. The reversal of 74745817 is 71854747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67584841 + 7160976 = 8221^2 + 2676^2 .

It is an emirp because it is prime and its reverse (71854747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74745817 - 2⁷ = 74745689 is a prime.

It is not a weakly prime, because it can be changed into another prime (74745877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37372908 + 37372909.

It is an arithmetic number, because the mean of its divisors is an integer number (37372909).

Almost surely, 2^74745817 is an apocalyptic number.

It is an amenable number.

74745817 is a deficient number, since it is larger than the sum of its proper divisors (1).

74745817 is an equidigital number, since it uses as much as digits as its factorization.

74745817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219520, while the sum is 43.

The square root of 74745817 is about 8645.5663203749. The cubic root of 74745817 is about 421.2393795513.

It can be divided in two parts, 747 and 45817, that added together give a palindrome (46564).

The spelling of 74745817 in words is "seventy-four million, seven hundred forty-five thousand, eight hundred seventeen".