645585546 has 16 divisors (see below), whose sum is σ = 1326068064. Its totient is φ = 209379024.

The previous prime is 645585533. The next prime is 645585547.

645585546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645585495 and 645585504.

It is not an unprimeable number, because it can be changed into a prime (645585547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1453800 + ... + 1454243.

It is an arithmetic number, because the mean of its divisors is an integer number (82879254).

Almost surely, 2^645585546 is an apocalyptic number.

645585546 is an abundant number, since it is smaller than the sum of its proper divisors (680482518).

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

645585546 is a wasteful number, since it uses less digits than its factorization.

645585546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908085.

The product of its digits is 2880000, while the sum is 48.

The square root of 645585546 is about 25408.3755088750. The cubic root of 645585546 is about 864.2736374998.

The spelling of 645585546 in words is "six hundred forty-five million, five hundred eighty-five thousand, five hundred forty-six".