1778313852 has 84 divisors (see below), whose sum is σ = 5332563376. Its totient is φ = 508083840.

The previous prime is 1778313851. The next prime is 1778313871. The reversal of 1778313852 is 2583138771.

It is a tau number, because it is divible by the number of its divisors (84).

It is a junction number, because it is equal to n+sod(n) for n = 1778313798 and 1778313807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778313851) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 23149 + ... + 63972.

Almost surely, 2^1778313852 is an apocalyptic number.

1778313852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1778313852 is an abundant number, since it is smaller than the sum of its proper divisors (3554249524).

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

1778313852 is an equidigital number, since it uses as much as digits as its factorization.

1778313852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87150 (or 87133 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1778313852 is about 42170.0587146852. The cubic root of 1778313852 is about 1211.5354802564.

The spelling of 1778313852 in words is "one billion, seven hundred seventy-eight million, three hundred thirteen thousand, eight hundred fifty-two".