645464546 has 16 divisors (see below), whose sum is σ = 991841280. Its totient is φ = 314934480.

The previous prime is 645464527. The next prime is 645464549.

645464546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645464546² = 833248960285972232, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 645464497 and 645464506.

It is not an unprimeable number, because it can be changed into a prime (645464549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5336 + ... + 36323.

It is an arithmetic number, because the mean of its divisors is an integer number (61990080).

Almost surely, 2^645464546 is an apocalyptic number.

645464546 is a deficient number, since it is larger than the sum of its proper divisors (346376734).

645464546 is a wasteful number, since it uses less digits than its factorization.

645464546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41849.

The product of its digits is 1382400, while the sum is 44.

The square root of 645464546 is about 25405.9942926861. The cubic root of 645464546 is about 864.2196381266.

The spelling of 645464546 in words is "six hundred forty-five million, four hundred sixty-four thousand, five hundred forty-six".