1786640328 has 160 divisors (see below), whose sum is σ = 5576376960. Its totient is φ = 529787520.

The previous prime is 1786640287. The next prime is 1786640333. The reversal of 1786640328 is 8230466871.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 332350 + ... + 337682.

It is an arithmetic number, because the mean of its divisors is an integer number (34852356).

Almost surely, 2^1786640328 is an apocalyptic number.

1786640328 is a gapful number since it is divisible by the number (18) 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 1786640328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2788188480).

1786640328 is an abundant number, since it is smaller than the sum of its proper divisors (3789736632).

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

1786640328 is a wasteful number, since it uses less digits than its factorization.

1786640328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409 (or 5396 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 1786640328 is about 42268.6683963429. The cubic root of 1786640328 is about 1213.4234329770.

The spelling of 1786640328 in words is "one billion, seven hundred eighty-six million, six hundred forty thousand, three hundred twenty-eight".