645698048 has 30 divisors (see below), whose sum is σ = 1291284819. Its totient is φ = 322561536.

The previous prime is 645698041. The next prime is 645698059. The reversal of 645698048 is 840896546.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 322849024 + 322849024 = 17968^2 + 17968^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17968.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645697987 and 645698005.

It is not an unprimeable number, because it can be changed into a prime (645698041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 574415 + ... + 575537.

Almost surely, 2^645698048 is an apocalyptic number.

It is an amenable number.

645698048 is a deficient number, since it is larger than the sum of its proper divisors (645586771).

645698048 is an frugal number, since it uses more digits than its factorization.

645698048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 645698048 is about 25410.5892887198. The cubic root of 645698048 is about 864.3238383683.

Multiplying 645698048 by its sum of digits (50), we get a square (32284902400 = 179680²).

The spelling of 645698048 in words is "six hundred forty-five million, six hundred ninety-eight thousand, forty-eight".