74520729 has 20 divisors (see below), whose sum is σ = 112435620. Its totient is φ = 49183200.

The previous prime is 74520727. The next prime is 74520731. The reversal of 74520729 is 92702547.

It is an interprime number because it is at equal distance from previous prime (74520727) and next prime (74520731).

It can be written as a sum of positive squares in 2 ways, for example, as 42575625 + 31945104 = 6525^2 + 5652^2 .

It is not a de Polignac number, because 74520729 - 2¹ = 74520727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74520693 and 74520702.

It is not an unprimeable number, because it can be changed into a prime (74520727) 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 in 19 ways as a sum of consecutive naturals, for example, 3627 + ... + 12735.

It is an arithmetic number, because the mean of its divisors is an integer number (5621781).

Almost surely, 2^74520729 is an apocalyptic number.

It is an amenable number.

74520729 is a deficient number, since it is larger than the sum of its proper divisors (37914891).

74520729 is a wasteful number, since it uses less digits than its factorization.

74520729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222 (or 9213 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 74520729 is about 8632.5389660285. The cubic root of 74520729 is about 420.8161172275.

The spelling of 74520729 in words is "seventy-four million, five hundred twenty thousand, seven hundred twenty-nine".