645760198 has 16 divisors (see below), whose sum is σ = 1026140400. Its totient is φ = 303732736.

The previous prime is 645760151. The next prime is 645760211. The reversal of 645760198 is 891067546.

645760198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 90153 + ... + 97051.

It is an arithmetic number, because the mean of its divisors is an integer number (64133775).

Almost surely, 2^645760198 is an apocalyptic number.

645760198 is a deficient number, since it is larger than the sum of its proper divisors (380380202).

645760198 is a wasteful number, since it uses less digits than its factorization.

645760198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9671.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 645760198 is about 25411.8121746561. The cubic root of 645760198 is about 864.3515685657.

The spelling of 645760198 in words is "six hundred forty-five million, seven hundred sixty thousand, one hundred ninety-eight".