645054600 has 48 divisors (see below), whose sum is σ = 1999671120. Its totient is φ = 172014400.

The previous prime is 645054587. The next prime is 645054601. The reversal of 645054600 is 6450546.

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

It is not an unprimeable number, because it can be changed into a prime (645054601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 536946 + ... + 538145.

It is an arithmetic number, because the mean of its divisors is an integer number (41659815).

Almost surely, 2^645054600 is an apocalyptic number.

645054600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645054600 is an abundant number, since it is smaller than the sum of its proper divisors (1354616520).

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

645054600 is a wasteful number, since it uses less digits than its factorization.

645054600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075110 (or 1075101 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 645054600 is about 25397.9251121032. The cubic root of 645054600 is about 864.0366389641.

645054600 divided by its reverse (6450546) gives a square (100 = 10²).

The spelling of 645054600 in words is "six hundred forty-five million, fifty-four thousand, six hundred".