645828546 has 48 divisors (see below), whose sum is σ = 1481522112. Its totient is φ = 187191840.

The previous prime is 645828541. The next prime is 645828577.

645828546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645828495 and 645828504.

It is not an unprimeable number, because it can be changed into a prime (645828541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2641 + ... + 36036.

It is an arithmetic number, because the mean of its divisors is an integer number (30865044).

Almost surely, 2^645828546 is an apocalyptic number.

645828546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645828546 is an abundant number, since it is smaller than the sum of its proper divisors (835693566).

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

645828546 is a wasteful number, since it uses less digits than its factorization.

645828546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38727 (or 38716 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 48.

The square root of 645828546 is about 25413.1569467471. The cubic root of 645828546 is about 864.3820621437.

The spelling of 645828546 in words is "six hundred forty-five million, eight hundred twenty-eight thousand, five hundred forty-six".