645034020 has 96 divisors (see below), whose sum is σ = 1846454400. Its totient is φ = 168198144.

The previous prime is 645034007. The next prime is 645034051. The reversal of 645034020 is 20430546.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 909426 + ... + 910134.

It is an arithmetic number, because the mean of its divisors is an integer number (19233900).

Almost surely, 2^645034020 is an apocalyptic number.

645034020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645034020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923227200).

645034020 is an abundant number, since it is smaller than the sum of its proper divisors (1201420380).

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

645034020 is a wasteful number, since it uses less digits than its factorization.

645034020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 645034020 is about 25397.5199576652. The cubic root of 645034020 is about 864.0274500452.

Adding to 645034020 its reverse (20430546), we get a palindrome (665464566).

It can be divided in two parts, 6450 and 34020, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 645034020 in words is "six hundred forty-five million, thirty-four thousand, twenty".