645546446 has 32 divisors (see below), whose sum is σ = 1005997440. Its totient is φ = 310542336.

The previous prime is 645546439. The next prime is 645546509. The reversal of 645546446 is 644645546.

645546446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645546397 and 645546406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1118510 + ... + 1119086.

It is an arithmetic number, because the mean of its divisors is an integer number (31437420).

Almost surely, 2^645546446 is an apocalyptic number.

645546446 is a deficient number, since it is larger than the sum of its proper divisors (360450994).

645546446 is a wasteful number, since it uses less digits than its factorization.

645546446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828.

The product of its digits is 1382400, while the sum is 44.

The square root of 645546446 is about 25407.6060659008. The cubic root of 645546446 is about 864.2561888535.

The spelling of 645546446 in words is "six hundred forty-five million, five hundred forty-six thousand, four hundred forty-six".