6138778 has 16 divisors (see below), whose sum is σ = 9710280. Its totient is φ = 2906176.

The previous prime is 6138739. The next prime is 6138779. The reversal of 6138778 is 8778316.

It can be written as a sum of positive squares in 4 ways, for example, as 4297329 + 1841449 = 2073^2 + 1357^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6138778.

It is not an unprimeable number, because it can be changed into a prime (6138779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2076 + ... + 4072.

Almost surely, 2^6138778 is an apocalyptic number.

6138778 is a deficient number, since it is larger than the sum of its proper divisors (3571502).

6138778 is a wasteful number, since it uses less digits than its factorization.

6138778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081.

The product of its digits is 56448, while the sum is 40.

The square root of 6138778 is about 2477.6557468704. The cubic root of 6138778 is about 183.1023743630.

The spelling of 6138778 in words is "six million, one hundred thirty-eight thousand, seven hundred seventy-eight".