75822821 has 4 divisors (see below), whose sum is σ = 76573644. Its totient is φ = 75072000.

The previous prime is 75822811. The next prime is 75822829. The reversal of 75822821 is 12822857.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12822857 = 2939 ⋅4363.

It can be written as a sum of positive squares in 2 ways, for example, as 73530625 + 2292196 = 8575^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 75822821 - 2¹⁰ = 75821797 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 (75822829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375260 + ... + 375461.

It is an arithmetic number, because the mean of its divisors is an integer number (19143411).

Almost surely, 2^75822821 is an apocalyptic number.

It is an amenable number.

75822821 is a deficient number, since it is larger than the sum of its proper divisors (750823).

75822821 is a wasteful number, since it uses less digits than its factorization.

75822821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750822.

The product of its digits is 17920, while the sum is 35.

The square root of 75822821 is about 8707.6300449663. The cubic root of 75822821 is about 423.2529360760.

The spelling of 75822821 in words is "seventy-five million, eight hundred twenty-two thousand, eight hundred twenty-one".