645350769 has 12 divisors (see below), whose sum is σ = 1065341056. Its totient is φ = 368771832.

The previous prime is 645350683. The next prime is 645350773. The reversal of 645350769 is 967053546.

It is not a de Polignac number, because 645350769 - 2⁸ = 645350513 is a prime.

It is a super-2 number, since 2×645350769² = 832955230097782722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645350779) 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, 5121769 + ... + 5121894.

Almost surely, 2^645350769 is an apocalyptic number.

It is an amenable number.

645350769 is a deficient number, since it is larger than the sum of its proper divisors (419990287).

645350769 is a wasteful number, since it uses less digits than its factorization.

645350769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10243676 (or 10243673 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The square root of 645350769 is about 25403.7550177134. The cubic root of 645350769 is about 864.1688560471.

The spelling of 645350769 in words is "six hundred forty-five million, three hundred fifty thousand, seven hundred sixty-nine".