645727536 has 30 divisors (see below), whose sum is σ = 1807140660. Its totient is φ = 215242464.

The previous prime is 645727519. The next prime is 645727547. The reversal of 645727536 is 635727546.

645727536 is a `hidden beast` number, since 6 + 4 + 572 + 75 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 645727491 and 645727500.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2241966 + ... + 2242253.

It is an arithmetic number, because the mean of its divisors is an integer number (60238022).

Almost surely, 2^645727536 is an apocalyptic number.

It is an amenable number.

645727536 is an abundant number, since it is smaller than the sum of its proper divisors (1161413124).

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

645727536 is a wasteful number, since it uses less digits than its factorization.

645727536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484233 (or 4484224 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 45.

The square root of 645727536 is about 25411.1695126375. The cubic root of 645727536 is about 864.3369955984.

The spelling of 645727536 in words is "six hundred forty-five million, seven hundred twenty-seven thousand, five hundred thirty-six".