876638621 has 4 divisors (see below), whose sum is σ = 881228544. Its totient is φ = 872048700.

The previous prime is 876638597. The next prime is 876638639. The reversal of 876638621 is 126836678.

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.

It is not a de Polignac number, because 876638621 - 2⁶ = 876638557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (876638641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294675 + ... + 2295056.

It is an arithmetic number, because the mean of its divisors is an integer number (220307136).

Almost surely, 2^876638621 is an apocalyptic number.

It is an amenable number.

876638621 is a deficient number, since it is larger than the sum of its proper divisors (4589923).

876638621 is a wasteful number, since it uses less digits than its factorization.

876638621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4589922.

The product of its digits is 580608, while the sum is 47.

The square root of 876638621 is about 29608.0837103653. The cubic root of 876638621 is about 957.0622798677.

The spelling of 876638621 in words is "eight hundred seventy-six million, six hundred thirty-eight thousand, six hundred twenty-one".