74066781 has 16 divisors (see below), whose sum is σ = 102760448. Its totient is φ = 47401200.

The previous prime is 74066777. The next prime is 74066789. The reversal of 74066781 is 18766047.

It is not a de Polignac number, because 74066781 - 2² = 74066777 is a prime.

It is a super-2 number, since 2×74066781² = 10971776095403922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74066789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8676 + ... + 14946.

It is an arithmetic number, because the mean of its divisors is an integer number (6422528).

Almost surely, 2^74066781 is an apocalyptic number.

It is an amenable number.

74066781 is a deficient number, since it is larger than the sum of its proper divisors (28693667).

74066781 is a wasteful number, since it uses less digits than its factorization.

74066781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 74066781 is about 8606.2059584930. The cubic root of 74066781 is about 419.9598997996.

It can be divided in two parts, 74066 and 781, that added together give a palindrome (74847).

The spelling of 74066781 in words is "seventy-four million, sixty-six thousand, seven hundred eighty-one".