6781490 has 16 divisors (see below), whose sum is σ = 12256920. Its totient is φ = 2701440.

The previous prime is 6781457. The next prime is 6781493. The reversal of 6781490 is 941876.

It can be written as a sum of positive squares in 4 ways, for example, as 1366561 + 5414929 = 1169^2 + 2327^2 .

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 6781490.

It is not an unprimeable number, because it can be changed into a prime (6781493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1430 + ... + 3950.

Almost surely, 2^6781490 is an apocalyptic number.

6781490 is a deficient number, since it is larger than the sum of its proper divisors (5475430).

6781490 is a wasteful number, since it uses less digits than its factorization.

6781490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 6781490 is about 2604.1294130669. The cubic root of 6781490 is about 189.2815899015.

The spelling of 6781490 in words is "six million, seven hundred eighty-one thousand, four hundred ninety".