645696050 has 12 divisors (see below), whose sum is σ = 1200994746. Its totient is φ = 258278400.

The previous prime is 645696047. The next prime is 645696097. The reversal of 645696050 is 50696546.

It can be written as a sum of positive squares in 3 ways, for example, as 558329641 + 87366409 = 23629^2 + 9347^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645695989 and 645696007.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6456911 + ... + 6457010.

Almost surely, 2^645696050 is an apocalyptic number.

645696050 is a deficient number, since it is larger than the sum of its proper divisors (555298696).

645696050 is a wasteful number, since it uses less digits than its factorization.

645696050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12913933 (or 12913928 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 645696050 is about 25410.5499743709. The cubic root of 645696050 is about 864.3229468675.

The spelling of 645696050 in words is "six hundred forty-five million, six hundred ninety-six thousand, fifty".