645147144 has 48 divisors (see below), whose sum is σ = 1850057820. Its totient is φ = 202398720.

The previous prime is 645147121. The next prime is 645147157. The reversal of 645147144 is 441741546.

It is a happy number.

645147144 is a `hidden beast` number, since 645 + 1 + 4 + 7 + 1 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 642014244 + 3132900 = 25338^2 + 1770^2 .

It is a super-2 number, since 2×645147144² = 832429674822713472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 645147099 and 645147108.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 262317 + ... + 264764.

Almost surely, 2^645147144 is an apocalyptic number.

It is an amenable number.

645147144 is an abundant number, since it is smaller than the sum of its proper divisors (1204910676).

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

645147144 is a wasteful number, since it uses less digits than its factorization.

645147144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527110 (or 527103 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 645147144 is about 25399.7469278731. The cubic root of 645147144 is about 864.0779572148.

The spelling of 645147144 in words is "six hundred forty-five million, one hundred forty-seven thousand, one hundred forty-four".