645997435 has 32 divisors (see below), whose sum is σ = 872363520. Its totient is φ = 456825600.

The previous prime is 645997379. The next prime is 645997439. The reversal of 645997435 is 534799546.

It is a happy number.

It is not a de Polignac number, because 645997435 - 2⁷ = 645997307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645997439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85980 + ... + 93190.

It is an arithmetic number, because the mean of its divisors is an integer number (27261360).

Almost surely, 2^645997435 is an apocalyptic number.

645997435 is a deficient number, since it is larger than the sum of its proper divisors (226366085).

645997435 is a wasteful number, since it uses less digits than its factorization.

645997435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299.

The product of its digits is 4082400, while the sum is 52.

The square root of 645997435 is about 25416.4795949400. The cubic root of 645997435 is about 864.4574030370.

The spelling of 645997435 in words is "six hundred forty-five million, nine hundred ninety-seven thousand, four hundred thirty-five".