645363546 has 16 divisors (see below), whose sum is σ = 1325612064. Its totient is φ = 209307024.

The previous prime is 645363491. The next prime is 645363559.

It is a happy number.

645363546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645363498 and 645363507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1453300 + ... + 1453743.

It is an arithmetic number, because the mean of its divisors is an integer number (82850754).

Almost surely, 2^645363546 is an apocalyptic number.

645363546 is an abundant number, since it is smaller than the sum of its proper divisors (680248518).

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

645363546 is a wasteful number, since it uses less digits than its factorization.

645363546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907085.

The product of its digits is 777600, while the sum is 42.

The square root of 645363546 is about 25404.0064950393. The cubic root of 645363546 is about 864.1745591020.

The spelling of 645363546 in words is "six hundred forty-five million, three hundred sixty-three thousand, five hundred forty-six".