645334884 has 96 divisors (see below), whose sum is σ = 1734656000. Its totient is φ = 207331488.

The previous prime is 645334847. The next prime is 645334913. The reversal of 645334884 is 488433546.

645334884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645334884² = 832914225014586912, which contains 22 as substring.

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, 365997 + ... + 367755.

Almost surely, 2^645334884 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 645334884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (867328000).

645334884 is an abundant number, since it is smaller than the sum of its proper divisors (1089321116).

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

645334884 is a wasteful number, since it uses less digits than its factorization.

645334884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894 (or 1886 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 645334884 is about 25403.4423651599. The cubic root of 645334884 is about 864.1617656214.

The spelling of 645334884 in words is "six hundred forty-five million, three hundred thirty-four thousand, eight hundred eighty-four".