645484620 has 48 divisors (see below), whose sum is σ = 1971664128. Its totient is φ = 156480960.

The previous prime is 645484597. The next prime is 645484621. The reversal of 645484620 is 26484546.

It is not an unprimeable number, because it can be changed into a prime (645484621) 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 15 ways as a sum of consecutive naturals, for example, 488344 + ... + 489663.

It is an arithmetic number, because the mean of its divisors is an integer number (41076336).

Almost surely, 2^645484620 is an apocalyptic number.

645484620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645484620 is an abundant number, since it is smaller than the sum of its proper divisors (1326179508).

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

645484620 is a wasteful number, since it uses less digits than its factorization.

645484620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978030 (or 978028 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The square root of 645484620 is about 25406.3893538614. The cubic root of 645484620 is about 864.2285971342.

The spelling of 645484620 in words is "six hundred forty-five million, four hundred eighty-four thousand, six hundred twenty".