645358560 has 384 divisors, whose sum is σ = 2670796800. Its totient is φ = 126904320.

The previous prime is 645358559. The next prime is 645358601. The reversal of 645358560 is 65853546.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 701781 + ... + 702699.

It is an arithmetic number, because the mean of its divisors is an integer number (6955200).

Almost surely, 2^645358560 is an apocalyptic number.

645358560 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 645358560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335398400).

645358560 is an abundant number, since it is smaller than the sum of its proper divisors (2025438240).

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

645358560 is a wasteful number, since it uses less digits than its factorization.

645358560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The square root of 645358560 is about 25403.9083607228. The cubic root of 645358560 is about 864.1723335938.

The spelling of 645358560 in words is "six hundred forty-five million, three hundred fifty-eight thousand, five hundred sixty".