645465576 has 64 divisors (see below), whose sum is σ = 1851655680. Its totient is φ = 183672000.

The previous prime is 645465563. The next prime is 645465581. The reversal of 645465576 is 675564546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34515 + ... + 49821.

It is an arithmetic number, because the mean of its divisors is an integer number (28932120).

Almost surely, 2^645465576 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 645465576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (925827840).

645465576 is an abundant number, since it is smaller than the sum of its proper divisors (1206190104).

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

645465576 is a wasteful number, since it uses less digits than its factorization.

645465576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15574 (or 15570 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 48.

The square root of 645465576 is about 25406.0145634848. The cubic root of 645465576 is about 864.2200978192.

The spelling of 645465576 in words is "six hundred forty-five million, four hundred sixty-five thousand, five hundred seventy-six".