75505993 has 4 divisors (see below), whose sum is σ = 79947540. Its totient is φ = 71064448.

The previous prime is 75505951. The next prime is 75505999. The reversal of 75505993 is 39950557.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39950557 = 659 ⋅60623.

It can be written as a sum of positive squares in 2 ways, for example, as 57638464 + 17867529 = 7592^2 + 4227^2 .

It is a cyclic number.

It is not a de Polignac number, because 75505993 - 2¹³ = 75497801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75505999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2220748 + ... + 2220781.

It is an arithmetic number, because the mean of its divisors is an integer number (19986885).

Almost surely, 2^75505993 is an apocalyptic number.

It is an amenable number.

75505993 is a deficient number, since it is larger than the sum of its proper divisors (4441547).

75505993 is a wasteful number, since it uses less digits than its factorization.

75505993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441546.

The product of its (nonzero) digits is 212625, while the sum is 43.

The square root of 75505993 is about 8689.4184500460. The cubic root of 75505993 is about 422.6625878918.

The spelling of 75505993 in words is "seventy-five million, five hundred five thousand, nine hundred ninety-three".