645200046 has 64 divisors (see below), whose sum is σ = 1464998400. Its totient is φ = 210420288.

The previous prime is 645200041. The next prime is 645200047. The reversal of 645200046 is 640002546.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 645199992 and 645200019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645200041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 996895 + ... + 997541.

It is an arithmetic number, because the mean of its divisors is an integer number (22890600).

Almost surely, 2^645200046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645200046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732499200).

645200046 is an abundant number, since it is smaller than the sum of its proper divisors (819798354).

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

645200046 is a wasteful number, since it uses less digits than its factorization.

645200046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030 (or 1024 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 645200046 is about 25400.7882948542. The cubic root of 645200046 is about 864.1015746707.

The spelling of 645200046 in words is "six hundred forty-five million, two hundred thousand, forty-six".