6987775 has 6 divisors (see below), whose sum is σ = 8664872. Its totient is φ = 5590200.

The previous prime is 6987769. The next prime is 6987793. The reversal of 6987775 is 5777896.

It is not a de Polignac number, because 6987775 - 2³ = 6987767 is a prime.

It is a Duffinian number.

6987775 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139731 + ... + 139780.

Almost surely, 2^6987775 is an apocalyptic number.

6987775 is a deficient number, since it is larger than the sum of its proper divisors (1677097).

6987775 is a wasteful number, since it uses less digits than its factorization.

6987775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279521 (or 279516 counting only the distinct ones).

The product of its digits is 740880, while the sum is 49.

The square root of 6987775 is about 2643.4399936446. The cubic root of 6987775 is about 191.1816934645.

The spelling of 6987775 in words is "six million, nine hundred eighty-seven thousand, seven hundred seventy-five".