6455778 has 64 divisors (see below), whose sum is σ = 15869952. Its totient is φ = 1710720.

The previous prime is 6455773. The next prime is 6455789. The reversal of 6455778 is 8775546.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a d-powerful number, because it can be written as 6⁶ + 4¹¹ + 5 + 5 + 7 + 7⁶ + 8⁷ .

It is not an unprimeable number, because it can be changed into a prime (6455773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39525 + ... + 39687.

It is an arithmetic number, because the mean of its divisors is an integer number (247968).

Almost surely, 2^6455778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6455778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7934976).

6455778 is an abundant number, since it is smaller than the sum of its proper divisors (9414174).

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

6455778 is a wasteful number, since it uses less digits than its factorization.

6455778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239.

The product of its digits is 235200, while the sum is 42.

The square root of 6455778 is about 2540.8223078366. The cubic root of 6455778 is about 186.2013659182.

The spelling of 6455778 in words is "six million, four hundred fifty-five thousand, seven hundred seventy-eight".