6128781 has 16 divisors (see below), whose sum is σ = 8372160. Its totient is φ = 3987200.

The previous prime is 6128779. The next prime is 6128783. The reversal of 6128781 is 1878216.

It is a happy number.

6128781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6128779) and next prime (6128783).

It is a cyclic number.

It is not a de Polignac number, because 6128781 - 2¹ = 6128779 is a prime.

It is a super-2 number, since 2×6128781² = 75123913091922, which contains 22 as substring.

It is a Curzon number.

6128781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6128783) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 34150 + ... + 34328.

It is an arithmetic number, because the mean of its divisors is an integer number (523260).

Almost surely, 2^6128781 is an apocalyptic number.

It is an amenable number.

6128781 is a deficient number, since it is larger than the sum of its proper divisors (2243379).

6128781 is a wasteful number, since it uses less digits than its factorization.

6128781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its digits is 5376, while the sum is 33.

The square root of 6128781 is about 2475.6374936569. The cubic root of 6128781 is about 183.0029262872.

The spelling of 6128781 in words is "six million, one hundred twenty-eight thousand, seven hundred eighty-one".