6887578349 has 2 divisors, whose sum is σ = 6887578350. Its totient is φ = 6887578348.

The previous prime is 6887578279. The next prime is 6887578361. The reversal of 6887578349 is 9438757886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3760755625 + 3126822724 = 61325^2 + 55918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6887578349 is a prime.

It is a super-2 number, since 2×6887578349² = 94877471027227131602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6887508349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3443789174 + 3443789175.

It is an arithmetic number, because the mean of its divisors is an integer number (3443789175).

Almost surely, 2^6887578349 is an apocalyptic number.

It is an amenable number.

6887578349 is a deficient number, since it is larger than the sum of its proper divisors (1).

6887578349 is an equidigital number, since it uses as much as digits as its factorization.

6887578349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 65.

The square root of 6887578349 is about 82991.4353954672. The cubic root of 6887578349 is about 1902.6351569349.

The spelling of 6887578349 in words is "six billion, eight hundred eighty-seven million, five hundred seventy-eight thousand, three hundred forty-nine".