1645213152 has 192 divisors, whose sum is σ = 5033871360. Its totient is φ = 465561600.

The previous prime is 1645213147. The next prime is 1645213159. The reversal of 1645213152 is 2513125461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645213159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 948478 + ... + 950210.

It is an arithmetic number, because the mean of its divisors is an integer number (26218080).

Almost surely, 2^1645213152 is an apocalyptic number.

1645213152 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 1645213152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2516935680).

1645213152 is an abundant number, since it is smaller than the sum of its proper divisors (3388658208).

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

1645213152 is a wasteful number, since it uses less digits than its factorization.

1645213152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817 (or 1809 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 1645213152 is about 40561.2272003696. The cubic root of 1645213152 is about 1180.5219255816.

The spelling of 1645213152 in words is "one billion, six hundred forty-five million, two hundred thirteen thousand, one hundred fifty-two".