1778028 has 48 divisors (see below), whose sum is σ = 4833024. Its totient is φ = 498240.

The previous prime is 1778027. The next prime is 1778033. The reversal of 1778028 is 8208771.

It is a super-2 number, since 2×1778028² = 6322767137568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1778028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4951 + ... + 5297.

It is an arithmetic number, because the mean of its divisors is an integer number (100688).

2^1778028 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 1778028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2416512).

1778028 is an abundant number, since it is smaller than the sum of its proper divisors (3054996).

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

1778028 is a wasteful number, since it uses less digits than its factorization.

1778028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 1778028 is about 1333.4271633651. The cubic root of 1778028 is about 121.1470561383.

The spelling of 1778028 in words is "one million, seven hundred seventy-eight thousand, twenty-eight".