645050650 has 24 divisors (see below), whose sum is σ = 1200736764. Its totient is φ = 257817600.

The previous prime is 645050641. The next prime is 645050657. The reversal of 645050650 is 56050546.

It can be written as a sum of positive squares in 6 ways, for example, as 173422561 + 471628089 = 13169^2 + 21717^2 .

It is not an unprimeable number, because it can be changed into a prime (645050657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70330 + ... + 78970.

Almost surely, 2^645050650 is an apocalyptic number.

645050650 is a deficient number, since it is larger than the sum of its proper divisors (555686114).

645050650 is a wasteful number, since it uses less digits than its factorization.

645050650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10146 (or 10141 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 645050650 is about 25397.8473497263. The cubic root of 645050650 is about 864.0348753141.

The spelling of 645050650 in words is "six hundred forty-five million, fifty thousand, six hundred fifty".