1778900000 has 72 divisors (see below), whose sum is σ = 4377727620. Its totient is φ = 711520000.

The previous prime is 1778899999. The next prime is 1778900027. The reversal of 1778900000 is 98771.

It can be written as a sum of positive squares in 6 ways, for example, as 2446096 + 1776453904 = 1564^2 + 42148^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1778900000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91106 + ... + 108894.

Almost surely, 2^1778900000 is an apocalyptic number.

1778900000 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 1778900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2188863810).

1778900000 is an abundant number, since it is smaller than the sum of its proper divisors (2598827620).

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

1778900000 is an frugal number, since it uses more digits than its factorization.

1778900000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17824 (or 17796 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 1778900000 is about 42177.0079545716. The cubic root of 1778900000 is about 1211.6685765767.

Adding to 1778900000 its reverse (98771), we get a palindrome (1778998771).

The spelling of 1778900000 in words is "one billion, seven hundred seventy-eight million, nine hundred thousand".