6990287 has 4 divisors (see below), whose sum is σ = 6997176. Its totient is φ = 6983400.

The previous prime is 6990259. The next prime is 6990289. The reversal of 6990287 is 7820996.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6990287 - 2²⁰ = 5941711 is a prime.

It is a super-2 number, since 2×6990287² = 97728224684738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990289) 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, 1589 + ... + 4062.

It is an arithmetic number, because the mean of its divisors is an integer number (1749294).

Almost surely, 2^6990287 is an apocalyptic number.

6990287 is a deficient number, since it is larger than the sum of its proper divisors (6889).

6990287 is a wasteful number, since it uses less digits than its factorization.

6990287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6888.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 6990287 is about 2643.9150894081. The cubic root of 6990287 is about 191.2045997009.

The spelling of 6990287 in words is "six million, nine hundred ninety thousand, two hundred eighty-seven".