645424546 has 16 divisors (see below), whose sum is σ = 1045611000. Its totient is φ = 297030528.

The previous prime is 645424543. The next prime is 645424579.

It is a happy number.

645424546 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 423742225 + 221682321 = 20585^2 + 14889^2 .

It is a super-2 number, since 2×645424546² = 833145689158612232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645424499 and 645424508.

It is not an unprimeable number, because it can be changed into a prime (645424543) 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, 26491 + ... + 44638.

Almost surely, 2^645424546 is an apocalyptic number.

645424546 is a deficient number, since it is larger than the sum of its proper divisors (400186454).

645424546 is a wasteful number, since it uses less digits than its factorization.

645424546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71493.

The product of its digits is 460800, while the sum is 40.

The square root of 645424546 is about 25405.2070646944. The cubic root of 645424546 is about 864.2017856100.

The spelling of 645424546 in words is "six hundred forty-five million, four hundred twenty-four thousand, five hundred forty-six".