75800821 has 4 divisors (see below), whose sum is σ = 75934144. Its totient is φ = 75667500.

The previous prime is 75800819. The next prime is 75800831. The reversal of 75800821 is 12800857.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12800857 = 23 ⋅556559.

It is a cyclic number.

It is not a de Polignac number, because 75800821 - 2¹ = 75800819 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 (75800831) 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 3 ways as a sum of consecutive naturals, for example, 65805 + ... + 66946.

It is an arithmetic number, because the mean of its divisors is an integer number (18983536).

Almost surely, 2^75800821 is an apocalyptic number.

It is an amenable number.

75800821 is a deficient number, since it is larger than the sum of its proper divisors (133323).

75800821 is a wasteful number, since it uses less digits than its factorization.

75800821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133322.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 75800821 is about 8706.3666934032. The cubic root of 75800821 is about 423.2119964873.

The spelling of 75800821 in words is "seventy-five million, eight hundred thousand, eight hundred twenty-one".