645436232 has 72 divisors (see below), whose sum is σ = 1486094310. Its totient is φ = 261999360.

The previous prime is 645436219. The next prime is 645436243. The reversal of 645436232 is 232634546.

It can be written as a sum of positive squares in only one way, i.e., 585930436 + 59505796 = 24206^2 + 7714^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 645436192 and 645436201.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 139232 + ... + 143792.

Almost surely, 2^645436232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645436232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743047155).

645436232 is an abundant number, since it is smaller than the sum of its proper divisors (840658078).

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

645436232 is a wasteful number, since it uses less digits than its factorization.

645436232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4619 (or 4589 counting only the distinct ones).

The product of its digits is 103680, while the sum is 35.

The square root of 645436232 is about 25405.4370558745. The cubic root of 645436232 is about 864.2070012990.

The spelling of 645436232 in words is "six hundred forty-five million, four hundred thirty-six thousand, two hundred thirty-two".