876638641 has 2 divisors, whose sum is σ = 876638642. Its totient is φ = 876638640.

The previous prime is 876638639. The next prime is 876638647. The reversal of 876638641 is 146836678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660695616 + 215943025 = 25704^2 + 14695^2 .

It is a cyclic number.

It is not a de Polignac number, because 876638641 - 2¹ = 876638639 is a prime.

Together with 876638639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (876638647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438319320 + 438319321.

It is an arithmetic number, because the mean of its divisors is an integer number (438319321).

Almost surely, 2^876638641 is an apocalyptic number.

It is an amenable number.

876638641 is a deficient number, since it is larger than the sum of its proper divisors (1).

876638641 is an equidigital number, since it uses as much as digits as its factorization.

876638641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 49.

The square root of 876638641 is about 29608.0840481109. The cubic root of 876638641 is about 957.0622871460.

The spelling of 876638641 in words is "eight hundred seventy-six million, six hundred thirty-eight thousand, six hundred forty-one".