645089307 has 4 divisors (see below), whose sum is σ = 860119080. Its totient is φ = 430059536.

The previous prime is 645089287. The next prime is 645089317. The reversal of 645089307 is 703980546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645089307 is a prime.

It is a super-2 number, since 2×645089307² = 832280428011480498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645089317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107514882 + ... + 107514887.

It is an arithmetic number, because the mean of its divisors is an integer number (215029770).

Almost surely, 2^645089307 is an apocalyptic number.

645089307 is a deficient number, since it is larger than the sum of its proper divisors (215029773).

645089307 is a wasteful number, since it uses less digits than its factorization.

645089307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215029772.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 645089307 is about 25398.6083673890. The cubic root of 645089307 is about 864.0521351106.

The spelling of 645089307 in words is "six hundred forty-five million, eighty-nine thousand, three hundred seven".