74528521 has 8 divisors (see below), whose sum is σ = 78076800. Its totient is φ = 71045520.

The previous prime is 74528513. The next prime is 74528539. The reversal of 74528521 is 12582547.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74528521 - 2³ = 74528513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74528551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13975 + ... + 18556.

It is an arithmetic number, because the mean of its divisors is an integer number (9759600).

Almost surely, 2^74528521 is an apocalyptic number.

It is an amenable number.

74528521 is a deficient number, since it is larger than the sum of its proper divisors (3548279).

74528521 is a wasteful number, since it uses less digits than its factorization.

74528521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32639.

The product of its digits is 22400, while the sum is 34.

The square root of 74528521 is about 8632.9902698891. The cubic root of 74528521 is about 420.8307837726.

The spelling of 74528521 in words is "seventy-four million, five hundred twenty-eight thousand, five hundred twenty-one".