1778480 has 80 divisors (see below), whose sum is σ = 4713984. Its totient is φ = 618240.

The previous prime is 1778477. The next prime is 1778531. The reversal of 1778480 is 848771.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1778480² = 6325982220800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1778480.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37817 + ... + 37863.

2^1778480 is an apocalyptic number.

1778480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2356992).

1778480 is an abundant number, since it is smaller than the sum of its proper divisors (2935504).

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

1778480 is a wasteful number, since it uses less digits than its factorization.

1778480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 1778480 is about 1333.5966406676. The cubic root of 1778480 is about 121.1573210366.

The spelling of 1778480 in words is "one million, seven hundred seventy-eight thousand, four hundred eighty".