1645152132 has 72 divisors (see below), whose sum is σ = 4183971456. Its totient is φ = 502879104.

The previous prime is 1645152079. The next prime is 1645152143. The reversal of 1645152132 is 2312515461.

It is a self number, because there is not a number n which added to its sum of digits gives 1645152132.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 315813 + ... + 320979.

Almost surely, 2^1645152132 is an apocalyptic number.

1645152132 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 1645152132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2091985728).

1645152132 is an abundant number, since it is smaller than the sum of its proper divisors (2538819324).

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

1645152132 is a wasteful number, since it uses less digits than its factorization.

1645152132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5357 (or 5342 counting only the distinct ones).

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

The square root of 1645152132 is about 40560.4749972187. The cubic root of 1645152132 is about 1180.5073304437.

Adding to 1645152132 its reverse (2312515461), we get a palindrome (3957667593).

The spelling of 1645152132 in words is "one billion, six hundred forty-five million, one hundred fifty-two thousand, one hundred thirty-two".