6890478887 has 2 divisors, whose sum is σ = 6890478888. Its totient is φ = 6890478886.

The previous prime is 6890478827. The next prime is 6890478911. The reversal of 6890478887 is 7888740986.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6890478887 - 2²⁰ = 6889430311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6890478817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445239443 + 3445239444.

It is an arithmetic number, because the mean of its divisors is an integer number (3445239444).

Almost surely, 2^6890478887 is an apocalyptic number.

6890478887 is a deficient number, since it is larger than the sum of its proper divisors (1).

6890478887 is an equidigital number, since it uses as much as digits as its factorization.

6890478887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43352064, while the sum is 65.

The square root of 6890478887 is about 83008.9084797529. The cubic root of 6890478887 is about 1902.9022024667.

The spelling of 6890478887 in words is "six billion, eight hundred ninety million, four hundred seventy-eight thousand, eight hundred eighty-seven".