645433500 has 48 divisors (see below), whose sum is σ = 1879506720. Its totient is φ = 172115200.

The previous prime is 645433499. The next prime is 645433517. The reversal of 645433500 is 5334546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a plaindrome in base 16.

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 15 ways as a sum of consecutive naturals, for example, 213645 + ... + 216644.

It is an arithmetic number, because the mean of its divisors is an integer number (39156390).

Almost surely, 2^645433500 is an apocalyptic number.

645433500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645433500 is an abundant number, since it is smaller than the sum of its proper divisors (1234073220).

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

645433500 is a wasteful number, since it uses less digits than its factorization.

645433500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430311 (or 430299 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 645433500 is about 25405.3832877995. The cubic root of 645433500 is about 864.2057819599.

The spelling of 645433500 in words is "six hundred forty-five million, four hundred thirty-three thousand, five hundred".