645489489 has 8 divisors (see below), whose sum is σ = 905950240. Its totient is φ = 407677536.

The previous prime is 645489461. The next prime is 645489497. The reversal of 645489489 is 984984546.

645489489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 645489489 - 2⁸ = 645489233 is a prime.

It is a super-2 number, since 2×645489489² = 833313360818962242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 11324377 = 645489489 / (6 + 4 + 5 + 4 + 8 + 9 + 4 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645489289) 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, 5662132 + ... + 5662245.

It is an arithmetic number, because the mean of its divisors is an integer number (113243780).

Almost surely, 2^645489489 is an apocalyptic number.

It is an amenable number.

645489489 is a deficient number, since it is larger than the sum of its proper divisors (260460751).

645489489 is a wasteful number, since it uses less digits than its factorization.

645489489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11324399.

The product of its digits is 9953280, while the sum is 57.

The square root of 645489489 is about 25406.4851760333. The cubic root of 645489489 is about 864.2307701364.

The spelling of 645489489 in words is "six hundred forty-five million, four hundred eighty-nine thousand, four hundred eighty-nine".