645404546 has 8 divisors (see below), whose sum is σ = 968394000. Its totient is φ = 322606548.

The previous prime is 645404533. The next prime is 645404563.

645404546 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×645404546² = 833094055994932232, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 39116 + ... + 53111.

It is an arithmetic number, because the mean of its divisors is an integer number (121049250).

Almost surely, 2^645404546 is an apocalyptic number.

645404546 is a deficient number, since it is larger than the sum of its proper divisors (322989454).

645404546 is a wasteful number, since it uses less digits than its factorization.

645404546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95728.

The product of its (nonzero) digits is 230400, while the sum is 38.

The square root of 645404546 is about 25404.8134415508. The cubic root of 645404546 is about 864.1928590751.

The spelling of 645404546 in words is "six hundred forty-five million, four hundred four thousand, five hundred forty-six".