75404521 has 8 divisors (see below), whose sum is σ = 79788320. Its totient is φ = 71062272.

The previous prime is 75404513. The next prime is 75404573. The reversal of 75404521 is 12540457.

75404521 = T₁₅₉₈ + T₁₅₉₉ + ... + T₁₆₅₄.

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 75404521 - 2³ = 75404513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75404521.

It is not an unprimeable number, because it can be changed into a prime (75404221) 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, 6615 + ... + 13948.

It is an arithmetic number, because the mean of its divisors is an integer number (9973540).

Almost surely, 2^75404521 is an apocalyptic number.

It is an amenable number.

75404521 is a deficient number, since it is larger than the sum of its proper divisors (4383799).

75404521 is a wasteful number, since it uses less digits than its factorization.

75404521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20775.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 75404521 is about 8683.5776613099. The cubic root of 75404521 is about 422.4731652016.

Adding to 75404521 its reverse (12540457), we get a palindrome (87944978).

The spelling of 75404521 in words is "seventy-five million, four hundred four thousand, five hundred twenty-one".