1827779556 has 48 divisors (see below), whose sum is σ = 4517965760. Its totient is φ = 573505920.

The previous prime is 1827779521. The next prime is 1827779579. The reversal of 1827779556 is 6559777281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 1827779496 and 1827779505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10266 + ... + 61326.

Almost surely, 2^1827779556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1827779556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2258982880).

1827779556 is an abundant number, since it is smaller than the sum of its proper divisors (2690186204).

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

1827779556 is a wasteful number, since it uses less digits than its factorization.

1827779556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51244 (or 51242 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 57.

The square root of 1827779556 is about 42752.5385912930. The cubic root of 1827779556 is about 1222.6662899158. Note that the first 3 decimals are identical.

The spelling of 1827779556 in words is "one billion, eight hundred twenty-seven million, seven hundred seventy-nine thousand, five hundred fifty-six".