1645894648 has 32 divisors (see below), whose sum is σ = 3182230800. Its totient is φ = 797675008.

The previous prime is 1645894639. The next prime is 1645894669. The reversal of 1645894648 is 8464985461.

It is a congruent number.

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, 11808 + ... + 58576.

Almost surely, 2^1645894648 is an apocalyptic number.

It is an amenable number.

1645894648 is a deficient number, since it is larger than the sum of its proper divisors (1536336152).

1645894648 is a wasteful number, since it uses less digits than its factorization.

1645894648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46911 (or 46907 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 55.

The square root of 1645894648 is about 40569.6271612151. The cubic root of 1645894648 is about 1180.6849054584.

The spelling of 1645894648 in words is "one billion, six hundred forty-five million, eight hundred ninety-four thousand, six hundred forty-eight".