645301730 has 8 divisors (see below), whose sum is σ = 1161543132. Its totient is φ = 258120688.

The previous prime is 645301729. The next prime is 645301757. The reversal of 645301730 is 37103546.

645301730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 593360881 + 51940849 = 24359^2 + 7207^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 645301693 and 645301702.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32265077 + ... + 32265096.

Almost surely, 2^645301730 is an apocalyptic number.

645301730 is a deficient number, since it is larger than the sum of its proper divisors (516241402).

645301730 is a wasteful number, since it uses less digits than its factorization.

645301730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64530180.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 645301730 is about 25402.7898074208. The cubic root of 645301730 is about 864.1469666333.

The spelling of 645301730 in words is "six hundred forty-five million, three hundred one thousand, seven hundred thirty".