1645210464 has 24 divisors (see below), whose sum is σ = 4318677720. Its totient is φ = 548403456.

The previous prime is 1645210459. The next prime is 1645210507. The reversal of 1645210464 is 4640125461.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8568709 + ... + 8568900.

It is an arithmetic number, because the mean of its divisors is an integer number (179944905).

Almost surely, 2^1645210464 is an apocalyptic number.

It is an amenable number.

1645210464 is an abundant number, since it is smaller than the sum of its proper divisors (2673467256).

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

1645210464 is a wasteful number, since it uses less digits than its factorization.

1645210464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17137622 (or 17137614 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 1645210464 is about 40561.1940652639. The cubic root of 1645210464 is about 1180.5212826569.

The spelling of 1645210464 in words is "one billion, six hundred forty-five million, two hundred ten thousand, four hundred sixty-four".