6966640 has 20 divisors (see below), whose sum is σ = 16197624. Its totient is φ = 2786624.

The previous prime is 6966629. The next prime is 6966643. The reversal of 6966640 is 466696.

6966640 = 451² + 452² + ... + 482².

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 6966640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6966643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43462 + ... + 43621.

Almost surely, 2^6966640 is an apocalyptic number.

It is an amenable number.

6966640 is an abundant number, since it is smaller than the sum of its proper divisors (9230984).

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

6966640 is a wasteful number, since it uses less digits than its factorization.

6966640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87096 (or 87090 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 6966640 is about 2639.4393344042. The cubic root of 6966640 is about 190.9887514734.

The spelling of 6966640 in words is "six million, nine hundred sixty-six thousand, six hundred forty".