1778064 has 40 divisors (see below), whose sum is σ = 4865760. Its totient is φ = 557568.

The previous prime is 1778059. The next prime is 1778069. The reversal of 1778064 is 4608771.

It is an interprime number because it is at equal distance from previous prime (1778059) and next prime (1778069).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778069) 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, 274 + ... + 1905.

It is an arithmetic number, because the mean of its divisors is an integer number (121644).

2^1778064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2432880).

1778064 is an abundant number, since it is smaller than the sum of its proper divisors (3087696).

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

1778064 is a wasteful number, since it uses less digits than its factorization.

1778064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207 (or 2201 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 1778064 is about 1333.4406623468. The cubic root of 1778064 is about 121.1478737603.

The spelling of 1778064 in words is "one million, seven hundred seventy-eight thousand, sixty-four".