1643284890 has 96 divisors (see below), whose sum is σ = 4749728256. Its totient is φ = 391443840.

The previous prime is 1643284883. The next prime is 1643284919. The reversal of 1643284890 is 984823461.

It is a happy number.

1643284890 is a `hidden beast` number, since 164 + 3 + 2 + 8 + 489 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13617 + ... + 58923.

It is an arithmetic number, because the mean of its divisors is an integer number (49476336).

Almost surely, 2^1643284890 is an apocalyptic number.

1643284890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1643284890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2374864128).

1643284890 is an abundant number, since it is smaller than the sum of its proper divisors (3106443366).

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

1643284890 is a wasteful number, since it uses less digits than its factorization.

1643284890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45364 (or 45361 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 1643284890 is about 40537.4504625044. The cubic root of 1643284890 is about 1180.0605374477.

The spelling of 1643284890 in words is "one billion, six hundred forty-three million, two hundred eighty-four thousand, eight hundred ninety".