6887987644 has 12 divisors (see below), whose sum is σ = 12055010968. Its totient is φ = 3443698800.

The previous prime is 6887987641. The next prime is 6887987647. The reversal of 6887987644 is 4467897886.

It is an interprime number because it is at equal distance from previous prime (6887987641) and next prime (6887987647).

It is a self number, because there is not a number n which added to its sum of digits gives 6887987644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6887987641) 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, 16242 + ... + 118489.

Almost surely, 2^6887987644 is an apocalyptic number.

It is an amenable number.

6887987644 is a deficient number, since it is larger than the sum of its proper divisors (5167023324).

6887987644 is a wasteful number, since it uses less digits than its factorization.

6887987644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147516 (or 147514 counting only the distinct ones).

The product of its digits is 130056192, while the sum is 67.

The square root of 6887987644 is about 82993.9012458144. The cubic root of 6887987644 is about 1902.6728442802.

The spelling of 6887987644 in words is "six billion, eight hundred eighty-seven million, nine hundred eighty-seven thousand, six hundred forty-four".