1643674890 has 192 divisors, whose sum is σ = 4754445696. Its totient is φ = 361152000.

The previous prime is 1643674853. The next prime is 1643674897. The reversal of 1643674890 is 984763461.

1643674890 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1643674897) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2878305 + ... + 2878875.

It is an arithmetic number, because the mean of its divisors is an integer number (24762738).

Almost surely, 2^1643674890 is an apocalyptic number.

1643674890 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 1643674890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2377222848).

1643674890 is an abundant number, since it is smaller than the sum of its proper divisors (3110770806).

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

1643674890 is a wasteful number, since it uses less digits than its factorization.

1643674890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The square root of 1643674890 is about 40542.2605437832. The cubic root of 1643674890 is about 1180.1538844603.

The spelling of 1643674890 in words is "one billion, six hundred forty-three million, six hundred seventy-four thousand, eight hundred ninety".