6556738 has 4 divisors (see below), whose sum is σ = 9835110. Its totient is φ = 3278368.

The previous prime is 6556727. The next prime is 6556741. The reversal of 6556738 is 8376556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5489649 + 1067089 = 2343^2 + 1033^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6556738.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1639183 + ... + 1639186.

Almost surely, 2^6556738 is an apocalyptic number.

6556738 is a deficient number, since it is larger than the sum of its proper divisors (3278372).

6556738 is a wasteful number, since it uses less digits than its factorization.

6556738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278371.

The product of its digits is 151200, while the sum is 40.

The square root of 6556738 is about 2560.6128172764. The cubic root of 6556738 is about 187.1669988640.

The spelling of 6556738 in words is "six million, five hundred fifty-six thousand, seven hundred thirty-eight".