75382821 has 6 divisors (see below), whose sum is σ = 108886310. Its totient is φ = 50255208.

The previous prime is 75382819. The next prime is 75382831. The reversal of 75382821 is 12828357.

It can be written as a sum of positive squares in only one way, i.e., 45077796 + 30305025 = 6714^2 + 5505^2 .

It is not a de Polignac number, because 75382821 - 2¹ = 75382819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75382831) 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 5 ways as a sum of consecutive naturals, for example, 4187926 + ... + 4187943.

Almost surely, 2^75382821 is an apocalyptic number.

It is an amenable number.

75382821 is a deficient number, since it is larger than the sum of its proper divisors (33503489).

75382821 is a wasteful number, since it uses less digits than its factorization.

75382821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8375875 (or 8375872 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 75382821 is about 8682.3280864063. The cubic root of 75382821 is about 422.4326347085.

The spelling of 75382821 in words is "seventy-five million, three hundred eighty-two thousand, eight hundred twenty-one".