74528129 has 4 divisors (see below), whose sum is σ = 80261076. Its totient is φ = 68795184.

The previous prime is 74528099. The next prime is 74528131. The reversal of 74528129 is 92182547.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14077504 + 60450625 = 3752^2 + 7775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74528129 is a prime.

It is a super-4 number, since 4×74528129⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74528092 and 74528101.

It is not an unprimeable number, because it can be changed into a prime (74528329) 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 3 ways as a sum of consecutive naturals, for example, 2866454 + ... + 2866479.

It is an arithmetic number, because the mean of its divisors is an integer number (20065269).

Almost surely, 2^74528129 is an apocalyptic number.

It is an amenable number.

74528129 is a deficient number, since it is larger than the sum of its proper divisors (5732947).

74528129 is a wasteful number, since it uses less digits than its factorization.

74528129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732946.

The product of its digits is 40320, while the sum is 38.

The square root of 74528129 is about 8632.9675662544. The cubic root of 74528129 is about 420.8300459524.

The spelling of 74528129 in words is "seventy-four million, five hundred twenty-eight thousand, one hundred twenty-nine".