6997664 has 12 divisors (see below), whose sum is σ = 13776714. Its totient is φ = 3498816.

The previous prime is 6997663. The next prime is 6997687. The reversal of 6997664 is 4667996.

6997664 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in only one way, i.e., 4080400 + 2917264 = 2020^2 + 1708^2 .

It is not an unprimeable number, because it can be changed into a prime (6997663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109307 + ... + 109370.

Almost surely, 2^6997664 is an apocalyptic number.

It is an amenable number.

6997664 is a deficient number, since it is larger than the sum of its proper divisors (6779050).

6997664 is a wasteful number, since it uses less digits than its factorization.

6997664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218687 (or 218679 counting only the distinct ones).

The product of its digits is 489888, while the sum is 47.

The square root of 6997664 is about 2645.3098117234. The cubic root of 6997664 is about 191.2718368276.

The spelling of 6997664 in words is "six million, nine hundred ninety-seven thousand, six hundred sixty-four".