645358080 has 160 divisors (see below), whose sum is σ = 2184931584. Its totient is φ = 161939456.

The previous prime is 645358073. The next prime is 645358171. The reversal of 645358080 is 80853546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

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, 128089 + ... + 133031.

Almost surely, 2^645358080 is an apocalyptic number.

645358080 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 645358080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092465792).

645358080 is an abundant number, since it is smaller than the sum of its proper divisors (1539573504).

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

645358080 is a wasteful number, since it uses less digits than its factorization.

645358080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4986 (or 4970 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 645358080 is about 25403.8989133558. The cubic root of 645358080 is about 864.1721193446.

The spelling of 645358080 in words is "six hundred forty-five million, three hundred fifty-eight thousand, eighty".