645554602 has 96 divisors (see below), whose sum is σ = 1323786240. Its totient is φ = 230234400.

The previous prime is 645554599. The next prime is 645554603. The reversal of 645554602 is 206455546.

645554602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645554603) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 997443 + ... + 998089.

It is an arithmetic number, because the mean of its divisors is an integer number (13789440).

Almost surely, 2^645554602 is an apocalyptic number.

645554602 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

645554602 is an abundant number, since it is smaller than the sum of its proper divisors (678231638).

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

645554602 is a wasteful number, since it uses less digits than its factorization.

645554602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 645554602 is about 25407.7665685121. The cubic root of 645554602 is about 864.2598285832.

The spelling of 645554602 in words is "six hundred forty-five million, five hundred fifty-four thousand, six hundred two".