645006832 has 40 divisors (see below), whose sum is σ = 1357928960. Its totient is φ = 295669440.

The previous prime is 645006787. The next prime is 645006839. The reversal of 645006832 is 238600546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645006839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24798 + ... + 43645.

It is an arithmetic number, because the mean of its divisors is an integer number (33948224).

Almost surely, 2^645006832 is an apocalyptic number.

645006832 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

645006832 is an abundant number, since it is smaller than the sum of its proper divisors (712922128).

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

645006832 is a wasteful number, since it uses less digits than its factorization.

645006832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68501 (or 68495 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 645006832 is about 25396.9847029131. The cubic root of 645006832 is about 864.0153103711.

The spelling of 645006832 in words is "six hundred forty-five million, six thousand, eight hundred thirty-two".