645008832 has 280 divisors, whose sum is σ = 2184080976. Its totient is φ = 186458112.

The previous prime is 645008821. The next prime is 645008839. The reversal of 645008832 is 238800546.

645008832 is a `hidden beast` number, since 645 + 0 + 0 + 8 + 8 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645008839) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1145383 + ... + 1145945.

Almost surely, 2^645008832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645008832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092040488).

645008832 is an abundant number, since it is smaller than the sum of its proper divisors (1539072144).

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

645008832 is a wasteful number, since it uses less digits than its factorization.

645008832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 645008832 is about 25397.0240776356. The cubic root of 645008832 is about 864.0162033998.

The spelling of 645008832 in words is "six hundred forty-five million, eight thousand, eight hundred thirty-two".