6690538 has 8 divisors (see below), whose sum is σ = 10088388. Its totient is φ = 3327744.

The previous prime is 6690517. The next prime is 6690557. The reversal of 6690538 is 8350966.

It can be written as a sum of positive squares in 2 ways, for example, as 5602689 + 1087849 = 2367^2 + 1043^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6690497 and 6690506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8281 + ... + 9052.

Almost surely, 2^6690538 is an apocalyptic number.

6690538 is a deficient number, since it is larger than the sum of its proper divisors (3397850).

6690538 is a wasteful number, since it uses less digits than its factorization.

6690538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17528.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6690538 is about 2586.6074305932. The cubic root of 6690538 is about 188.4315760353.

The spelling of 6690538 in words is "six million, six hundred ninety thousand, five hundred thirty-eight".