645696048 has 20 divisors (see below), whose sum is σ = 1668048248. Its totient is φ = 215232000.

The previous prime is 645696047. The next prime is 645696097. The reversal of 645696048 is 840696546.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 13452001 = 645696048 / (6 + 4 + 5 + 6 + 9 + 6 + 0 + 4 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 645695988 and 645696006.

It is not an unprimeable number, because it can be changed into a prime (645696047) 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, 6725953 + ... + 6726048.

Almost surely, 2^645696048 is an apocalyptic number.

It is an amenable number.

645696048 is an abundant number, since it is smaller than the sum of its proper divisors (1022352200).

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

645696048 is a wasteful number, since it uses less digits than its factorization.

645696048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13452012 (or 13452006 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 645696048 is about 25410.5499350171. The cubic root of 645696048 is about 864.3229459752.

The spelling of 645696048 in words is "six hundred forty-five million, six hundred ninety-six thousand, forty-eight".