645398448 has 40 divisors (see below), whose sum is σ = 1668361968. Its totient is φ = 214993152.

The previous prime is 645398431. The next prime is 645398459. The reversal of 645398448 is 844893546.

It is a self number, because there is not a number n which added to its sum of digits gives 645398448.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92490 + ... + 99222.

Almost surely, 2^645398448 is an apocalyptic number.

It is an amenable number.

645398448 is an abundant number, since it is smaller than the sum of its proper divisors (1022963520).

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

645398448 is a wasteful number, since it uses less digits than its factorization.

645398448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8741 (or 8735 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The square root of 645398448 is about 25404.6934246410. The cubic root of 645398448 is about 864.1901373379.

The spelling of 645398448 in words is "six hundred forty-five million, three hundred ninety-eight thousand, four hundred forty-eight".