74718781 has 2 divisors, whose sum is σ = 74718782. Its totient is φ = 74718780.

The previous prime is 74718719. The next prime is 74718797. The reversal of 74718781 is 18781747.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73359225 + 1359556 = 8565^2 + 1166^2 .

It is a cyclic number.

It is not a de Polignac number, because 74718781 - 2⁷ = 74718653 is a prime.

It is a super-2 number, since 2×74718781² = 11165792468251922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74718701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37359390 + 37359391.

It is an arithmetic number, because the mean of its divisors is an integer number (37359391).

Almost surely, 2^74718781 is an apocalyptic number.

It is an amenable number.

74718781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74718781 is an equidigital number, since it uses as much as digits as its factorization.

74718781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87808, while the sum is 43.

The square root of 74718781 is about 8644.0026029612. The cubic root of 74718781 is about 421.1885851759.

The spelling of 74718781 in words is "seventy-four million, seven hundred eighteen thousand, seven hundred eighty-one".