1643212632 has 64 divisors (see below), whose sum is σ = 4217096160. Its totient is φ = 533376000.

The previous prime is 1643212631. The next prime is 1643212643. The reversal of 1643212632 is 2362123461.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1643212632.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643212631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142308 + ... + 153420.

Almost surely, 2^1643212632 is an apocalyptic number.

1643212632 is a gapful number since it is divisible by the number (12) 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 1643212632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2108548080).

1643212632 is an abundant number, since it is smaller than the sum of its proper divisors (2573883528).

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

1643212632 is a wasteful number, since it uses less digits than its factorization.

1643212632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11284 (or 11280 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 1643212632 is about 40536.5592027740. The cubic root of 1643212632 is about 1180.0432407787.

The spelling of 1643212632 in words is "one billion, six hundred forty-three million, two hundred twelve thousand, six hundred thirty-two".