50664821 has 4 divisors (see below), whose sum is σ = 51138432. Its totient is φ = 50191212.

The previous prime is 50664799. The next prime is 50664829. The reversal of 50664821 is 12846605.

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: 12846605 = 5 ⋅2569321.

It is a cyclic number.

It is not a de Polignac number, because 50664821 - 2²² = 46470517 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 (50664829) 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, 236645 + ... + 236858.

It is an arithmetic number, because the mean of its divisors is an integer number (12784608).

Almost surely, 2^50664821 is an apocalyptic number.

It is an amenable number.

50664821 is a deficient number, since it is larger than the sum of its proper divisors (473611).

50664821 is a wasteful number, since it uses less digits than its factorization.

50664821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473610.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 50664821 is about 7117.9225199492. The cubic root of 50664821 is about 370.0287803276.

The spelling of 50664821 in words is "fifty million, six hundred sixty-four thousand, eight hundred twenty-one".