6990690 has 32 divisors (see below), whose sum is σ = 19175040. Its totient is φ = 1597824.

The previous prime is 6990679. The next prime is 6990691. The reversal of 6990690 is 960996.

It is a super-2 number, since 2×6990690² = 97739493352200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16435 + ... + 16854.

It is an arithmetic number, because the mean of its divisors is an integer number (599220).

Almost surely, 2^6990690 is an apocalyptic number.

6990690 is an abundant number, since it is smaller than the sum of its proper divisors (12184350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6990690 is a wasteful number, since it uses less digits than its factorization.

6990690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33306.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 6990690 is about 2643.9913010447. The cubic root of 6990690 is about 191.2082740361.

It can be divided in two parts, 69906 and 90, that added together give a palindrome (69996).

The spelling of 6990690 in words is "six million, nine hundred ninety thousand, six hundred ninety".