1778217480 has 192 divisors, whose sum is σ = 6245694000. Its totient is φ = 436174848.

The previous prime is 1778217473. The next prime is 1778217491. The reversal of 1778217480 is 847128771.

1778217480 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 322489764 + 1455727716 = 17958^2 + 38154^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 1913656 + ... + 1914584.

Almost surely, 2^1778217480 is an apocalyptic number.

1778217480 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 1778217480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3122847000).

1778217480 is an abundant number, since it is smaller than the sum of its proper divisors (4467476520).

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

1778217480 is a wasteful number, since it uses less digits than its factorization.

1778217480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1361 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 1778217480 is about 42168.9160401355. The cubic root of 1778217480 is about 1211.5135943172.

The spelling of 1778217480 in words is "one billion, seven hundred seventy-eight million, two hundred seventeen thousand, four hundred eighty".