645354432 has 112 divisors (see below), whose sum is σ = 1943709600. Its totient is φ = 209848320.

The previous prime is 645354427. The next prime is 645354433. The reversal of 645354432 is 234453546.

645354432 is a `hidden beast` number, since 64 + 53 + 544 + 3 + 2 = 666.

645354432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645354433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66294 + ... + 75402.

It is an arithmetic number, because the mean of its divisors is an integer number (17354550).

Almost surely, 2^645354432 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 645354432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971854800).

645354432 is an abundant number, since it is smaller than the sum of its proper divisors (1298355168).

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

645354432 is a wasteful number, since it uses less digits than its factorization.

645354432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9171 (or 9155 counting only the distinct ones).

The product of its digits is 172800, while the sum is 36.

The square root of 645354432 is about 25403.8271132521. The cubic root of 645354432 is about 864.1704910466.

The spelling of 645354432 in words is "six hundred forty-five million, three hundred fifty-four thousand, four hundred thirty-two".