74563781 has 2 divisors, whose sum is σ = 74563782. Its totient is φ = 74563780.

The previous prime is 74563747. The next prime is 74563807. The reversal of 74563781 is 18736547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74114881 + 448900 = 8609^2 + 670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74563781 is a prime.

It is a super-2 number, since 2×74563781² = 11119514874031922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74563381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37281890 + 37281891.

It is an arithmetic number, because the mean of its divisors is an integer number (37281891).

Almost surely, 2^74563781 is an apocalyptic number.

It is an amenable number.

74563781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74563781 is an equidigital number, since it uses as much as digits as its factorization.

74563781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 41.

The square root of 74563781 is about 8635.0321944970. The cubic root of 74563781 is about 420.8971393717.

The spelling of 74563781 in words is "seventy-four million, five hundred sixty-three thousand, seven hundred eighty-one".