6642738 has 24 divisors (see below), whose sum is σ = 14745276. Its totient is φ = 2160000.

The previous prime is 6642709. The next prime is 6642763. The reversal of 6642738 is 8372466.

6642738 is a `hidden beast` number, since 6 + 642 + 7 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5349969 + 1292769 = 2313^2 + 1137^2 .

It is a d-powerful number, because it can be written as 6⁶ + 6⁸ + 4² + 2¹⁷ + 7⁴ + 3¹⁴ + 8 .

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3763 + ... + 5238.

Almost surely, 2^6642738 is an apocalyptic number.

6642738 is an abundant number, since it is smaller than the sum of its proper divisors (8102538).

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

6642738 is a wasteful number, since it uses less digits than its factorization.

6642738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9050 (or 9047 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 6642738 is about 2577.3509656234. The cubic root of 6642738 is about 187.9817584534.

It can be divided in two parts, 6642 and 738, that multiplied together give a square (4901796 = 2214²).

The spelling of 6642738 in words is "six million, six hundred forty-two thousand, seven hundred thirty-eight".