6887620021 has 16 divisors (see below), whose sum is σ = 7202580480. Its totient is φ = 6578732160.

The previous prime is 6887620013. The next prime is 6887620027. The reversal of 6887620021 is 1200267886.

It is a cyclic number.

It is not a de Polignac number, because 6887620021 - 2³ = 6887620013 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 (6887620027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1799716 + ... + 1803538.

It is an arithmetic number, because the mean of its divisors is an integer number (450161280).

Almost surely, 2^6887620021 is an apocalyptic number.

It is an amenable number.

6887620021 is a deficient number, since it is larger than the sum of its proper divisors (314960459).

6887620021 is a wasteful number, since it uses less digits than its factorization.

6887620021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 6887620021 is about 82991.6864571386. The cubic root of 6887620021 is about 1902.6389941061.

The spelling of 6887620021 in words is "six billion, eight hundred eighty-seven million, six hundred twenty thousand, twenty-one".