6990638692 has 6 divisors (see below), whose sum is σ = 12233617718. Its totient is φ = 3495319344.

The previous prime is 6990638657. The next prime is 6990638693. The reversal of 6990638692 is 2968360996.

It can be written as a sum of positive squares in only one way, i.e., 4830806016 + 2159832676 = 69504^2 + 46474^2 .

It is not an unprimeable number, because it can be changed into a prime (6990638693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 873829833 + ... + 873829840.

Almost surely, 2^6990638692 is an apocalyptic number.

It is an amenable number.

6990638692 is a deficient number, since it is larger than the sum of its proper divisors (5242979026).

6990638692 is a wasteful number, since it uses less digits than its factorization.

6990638692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747659677 (or 1747659675 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 58.

The square root of 6990638692 is about 83610.0394211126. The cubic root of 6990638692 is about 1912.0780624542.

The spelling of 6990638692 in words is "six billion, nine hundred ninety million, six hundred thirty-eight thousand, six hundred ninety-two".