645136562 has 32 divisors (see below), whose sum is σ = 1133101440. Its totient is φ = 269769600.

The previous prime is 645136561. The next prime is 645136573. The reversal of 645136562 is 265631546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645136561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110312 + ... + 116012.

It is an arithmetic number, because the mean of its divisors is an integer number (35409420).

Almost surely, 2^645136562 is an apocalyptic number.

645136562 is a deficient number, since it is larger than the sum of its proper divisors (487964878).

645136562 is a wasteful number, since it uses less digits than its factorization.

645136562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5906.

The product of its digits is 129600, while the sum is 38.

The square root of 645136562 is about 25399.5386178568. The cubic root of 645136562 is about 864.0732328544.

The spelling of 645136562 in words is "six hundred forty-five million, one hundred thirty-six thousand, five hundred sixty-two".