645747546 has 32 divisors (see below), whose sum is σ = 1340591616. Its totient is φ = 207144000.

The previous prime is 645747521. The next prime is 645747559.

645747546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645747495 and 645747504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24076 + ... + 43256.

It is an arithmetic number, because the mean of its divisors is an integer number (41893488).

Almost surely, 2^645747546 is an apocalyptic number.

645747546 is an abundant number, since it is smaller than the sum of its proper divisors (694844070).

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

645747546 is a wasteful number, since it uses less digits than its factorization.

645747546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19398.

The product of its digits is 2822400, while the sum is 48.

The square root of 645747546 is about 25411.5632340870. The cubic root of 645747546 is about 864.3459236181.

The spelling of 645747546 in words is "six hundred forty-five million, seven hundred forty-seven thousand, five hundred forty-six".