1643461120 has 80 divisors (see below), whose sum is σ = 4503426048. Its totient is φ = 563466240.

The previous prime is 1643461093. The next prime is 1643461123. The reversal of 1643461120 is 211643461.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1643461123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27936 + ... + 63775.

Almost surely, 2^1643461120 is an apocalyptic number.

1643461120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643461120 is an abundant number, since it is smaller than the sum of its proper divisors (2859964928).

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

1643461120 is an frugal number, since it uses more digits than its factorization.

1643461120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91741 (or 91725 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1643461120 is about 40539.6240732447. The cubic root of 1643461120 is about 1180.1027201587.

The spelling of 1643461120 in words is "one billion, six hundred forty-three million, four hundred sixty-one thousand, one hundred twenty".