6990706 has 16 divisors (see below), whose sum is σ = 11405016. Its totient is φ = 3200256.

The previous prime is 6990703. The next prime is 6990721. The reversal of 6990706 is 6070996.

6990706 = 74² + 75² + ... + 277².

It can be written as a sum of positive squares in 4 ways, for example, as 6548481 + 442225 = 2559^2 + 665^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6990701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1521 + ... + 4036.

Almost surely, 2^6990706 is an apocalyptic number.

6990706 is a deficient number, since it is larger than the sum of its proper divisors (4414310).

6990706 is a wasteful number, since it uses less digits than its factorization.

6990706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5613.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 6990706 is about 2643.9943267715. The cubic root of 6990706 is about 191.2084199125.

The spelling of 6990706 in words is "six million, nine hundred ninety thousand, seven hundred six".