645563376 has 60 divisors (see below), whose sum is σ = 1828481928. Its totient is φ = 212591232.

The previous prime is 645563353. The next prime is 645563381. The reversal of 645563376 is 673365546.

645563376 is a `hidden beast` number, since 6 + 4 + 5 + 5 + 633 + 7 + 6 = 666.

645563376 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15055 + ... + 38958.

Almost surely, 2^645563376 is an apocalyptic number.

It is an amenable number.

645563376 is an abundant number, since it is smaller than the sum of its proper divisors (1182918552).

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

645563376 is a wasteful number, since it uses less digits than its factorization.

645563376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54110 (or 54101 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 45.

The square root of 645563376 is about 25407.9392316654. The cubic root of 645563376 is about 864.2637440699.

The spelling of 645563376 in words is "six hundred forty-five million, five hundred sixty-three thousand, three hundred seventy-six".