645350775 has 24 divisors (see below), whose sum is σ = 1103776080. Its totient is φ = 332317440.

The previous prime is 645350773. The next prime is 645350779. The reversal of 645350775 is 577053546.

It is not a de Polignac number, because 645350775 - 2¹ = 645350773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645350773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146182 + ... + 150531.

It is an arithmetic number, because the mean of its divisors is an integer number (45990670).

Almost surely, 2^645350775 is an apocalyptic number.

645350775 is a deficient number, since it is larger than the sum of its proper divisors (458425305).

645350775 is a wasteful number, since it uses less digits than its factorization.

645350775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296755 (or 296750 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 42.

The square root of 645350775 is about 25403.7551358062. The cubic root of 645350775 is about 864.1688587252.

The spelling of 645350775 in words is "six hundred forty-five million, three hundred fifty thousand, seven hundred seventy-five".