1645341964 has 48 divisors (see below), whose sum is σ = 3367526400. Its totient is φ = 688798656.

The previous prime is 1645341913. The next prime is 1645341967. The reversal of 1645341964 is 4691435461.

It is a self number, because there is not a number n which added to its sum of digits gives 1645341964.

It is not an unprimeable number, because it can be changed into a prime (1645341967) 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 15 ways as a sum of consecutive naturals, for example, 352357 + ... + 356995.

It is an arithmetic number, because the mean of its divisors is an integer number (70156800).

Almost surely, 2^1645341964 is an apocalyptic number.

1645341964 is a gapful number since it is divisible by the number (14) 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 1645341964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1683763200).

1645341964 is an abundant number, since it is smaller than the sum of its proper divisors (1722184436).

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

1645341964 is a wasteful number, since it uses less digits than its factorization.

1645341964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4940 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 1645341964 is about 40562.8150403790. The cubic root of 1645341964 is about 1180.5527344410.

The spelling of 1645341964 in words is "one billion, six hundred forty-five million, three hundred forty-one thousand, nine hundred sixty-four".