645408146 has 8 divisors (see below), whose sum is σ = 968525964. Its totient is φ = 322566160.

The previous prime is 645408109. The next prime is 645408149. The reversal of 645408146 is 641804546.

It can be written as a sum of positive squares in 2 ways, for example, as 627252025 + 18156121 = 25045^2 + 4261^2 .

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

It is not an unprimeable number, because it can be changed into a prime (645408149) 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 3 ways as a sum of consecutive naturals, for example, 63005 + ... + 72528.

Almost surely, 2^645408146 is an apocalyptic number.

645408146 is a deficient number, since it is larger than the sum of its proper divisors (323117818).

645408146 is a wasteful number, since it uses less digits than its factorization.

645408146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137916.

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 645408146 is about 25404.8842941667. The cubic root of 645408146 is about 864.1944658650.

The spelling of 645408146 in words is "six hundred forty-five million, four hundred eight thousand, one hundred forty-six".