645331445 has 32 divisors (see below), whose sum is σ = 869201280. Its totient is φ = 455952640.

The previous prime is 645331417. The next prime is 645331469. The reversal of 645331445 is 544133546.

It is not a de Polignac number, because 645331445 - 2⁶ = 645331381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310871 + ... + 312939.

It is an arithmetic number, because the mean of its divisors is an integer number (27162540).

Almost surely, 2^645331445 is an apocalyptic number.

It is an amenable number.

645331445 is a deficient number, since it is larger than the sum of its proper divisors (223869835).

645331445 is a wasteful number, since it uses less digits than its factorization.

645331445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245.

The product of its digits is 86400, while the sum is 35.

The square root of 645331445 is about 25403.3746773928. The cubic root of 645331445 is about 864.1602305747.

The spelling of 645331445 in words is "six hundred forty-five million, three hundred thirty-one thousand, four hundred forty-five".