1778224560 has 160 divisors (see below), whose sum is σ = 6326595072. Its totient is φ = 404736000.

The previous prime is 1778224549. The next prime is 1778224589. The reversal of 1778224560 is 654228771.

It is a Cunningham number, because it is equal to 42169²-1.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419572 + ... + 423788.

Almost surely, 2^1778224560 is an apocalyptic number.

1778224560 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 1778224560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3163297536).

1778224560 is an abundant number, since it is smaller than the sum of its proper divisors (4548370512).

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

1778224560 is a wasteful number, since it uses less digits than its factorization.

1778224560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491 (or 4485 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 1778224560 is about 42168.9999881429. Note that the first 4 decimals coincide. The cubic root of 1778224560 is about 1211.5152022017.

The spelling of 1778224560 in words is "one billion, seven hundred seventy-eight million, two hundred twenty-four thousand, five hundred sixty".