1778000000 has 224 divisors, whose sum is σ = 5099934720. Its totient is φ = 604800000.

The previous prime is 1777999999. The next prime is 1778000011. The reversal of 1778000000 is 8771.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×1778000000² = 6322568000000000000, 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 1778000000.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 13999937 + ... + 14000063.

Almost surely, 2^1778000000 is an apocalyptic number.

1778000000 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 1778000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2549967360).

1778000000 is an abundant number, since it is smaller than the sum of its proper divisors (3321934720).

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

1778000000 is an frugal number, since it uses more digits than its factorization.

1778000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 1778000000 is about 42166.3372846160. The cubic root of 1778000000 is about 1211.4642020238.

Adding to 1778000000 its reverse (8771), we get a palindrome (1778008771).

The spelling of 1778000000 in words is "one billion, seven hundred seventy-eight million", and thus it is an aban number.