74006721 has 6 divisors (see below), whose sum is σ = 106898610. Its totient is φ = 49337808.

The previous prime is 74006711. The next prime is 74006731. The reversal of 74006721 is 12760047.

It is an interprime number because it is at equal distance from previous prime (74006711) and next prime (74006731).

It can be written as a sum of positive squares in only one way, i.e., 60279696 + 13727025 = 7764^2 + 3705^2 .

It is not a de Polignac number, because 74006721 - 2⁹ = 74006209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (74006711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4111476 + ... + 4111493.

It is an arithmetic number, because the mean of its divisors is an integer number (17816435).

Almost surely, 2^74006721 is an apocalyptic number.

It is an amenable number.

74006721 is a deficient number, since it is larger than the sum of its proper divisors (32891889).

74006721 is a wasteful number, since it uses less digits than its factorization.

74006721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8222975 (or 8222972 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 74006721 is about 8602.7159083629. The cubic root of 74006721 is about 419.8463553651.

Adding to 74006721 its reverse (12760047), we get a palindrome (86766768).

The spelling of 74006721 in words is "seventy-four million, six thousand, seven hundred twenty-one".