74263781 has 2 divisors, whose sum is σ = 74263782. Its totient is φ = 74263780.

The previous prime is 74263747. The next prime is 74263793. The reversal of 74263781 is 18736247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 10023556 = 8015^2 + 3166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74263781 is a prime.

It is a super-2 number, since 2×74263781² = 11030218336831922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_4353698 and since 74263781 and 4353698 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74262781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37131890 + 37131891.

It is an arithmetic number, because the mean of its divisors is an integer number (37131891).

Almost surely, 2^74263781 is an apocalyptic number.

It is an amenable number.

74263781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74263781 is an equidigital number, since it uses as much as digits as its factorization.

74263781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 74263781 is about 8617.6435874315. The cubic root of 74263781 is about 420.3319012921.

The spelling of 74263781 in words is "seventy-four million, two hundred sixty-three thousand, seven hundred eighty-one".