1780220880 has 240 divisors, whose sum is σ = 6306453504. Its totient is φ = 449372160.

The previous prime is 1780220879. The next prime is 1780220899. The reversal of 1780220880 is 880220871.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1048192 + ... + 1049888.

Almost surely, 2^1780220880 is an apocalyptic number.

1780220880 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 1780220880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3153226752).

1780220880 is an abundant number, since it is smaller than the sum of its proper divisors (4526232624).

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

1780220880 is a wasteful number, since it uses less digits than its factorization.

1780220880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1785 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 1780220880 is about 42192.6638173036. The cubic root of 1780220880 is about 1211.9684009668.

Subtracting from 1780220880 its reverse (880220871), we obtain a palindrome (900000009).

The spelling of 1780220880 in words is "one billion, seven hundred eighty million, two hundred twenty thousand, eight hundred eighty".