74698781 has 2 divisors, whose sum is σ = 74698782. Its totient is φ = 74698780.

The previous prime is 74698753. The next prime is 74698787. The reversal of 74698781 is 18789647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 8031556 = 8165^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 74698781 - 2⁶ = 74698717 is a prime.

It is a super-2 number, since 2×74698781² = 11159815765771922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74698787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37349390 + 37349391.

It is an arithmetic number, because the mean of its divisors is an integer number (37349391).

Almost surely, 2^74698781 is an apocalyptic number.

It is an amenable number.

74698781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74698781 is an equidigital number, since it uses as much as digits as its factorization.

74698781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 50.

The square root of 74698781 is about 8642.8456540656. The cubic root of 74698781 is about 421.1510019280.

The spelling of 74698781 in words is "seventy-four million, six hundred ninety-eight thousand, seven hundred eighty-one".