645435630 has 96 divisors (see below), whose sum is σ = 1926535104. Its totient is φ = 146861568.

The previous prime is 645435613. The next prime is 645435647. The reversal of 645435630 is 36534546.

645435630 is a `hidden beast` number, since 64 + 543 + 56 + 3 + 0 = 666.

645435630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645435613) and next prime (645435647).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144592 + ... + 148988.

It is an arithmetic number, because the mean of its divisors is an integer number (20068074).

Almost surely, 2^645435630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645435630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963267552).

645435630 is an abundant number, since it is smaller than the sum of its proper divisors (1281099474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645435630 is a wasteful number, since it uses less digits than its factorization.

645435630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650 (or 4647 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 645435630 is about 25405.4252080141. The cubic root of 645435630 is about 864.2067326162.

The spelling of 645435630 in words is "six hundred forty-five million, four hundred thirty-five thousand, six hundred thirty".