647891145 has 48 divisors (see below), whose sum is σ = 1230413184. Its totient is φ = 312768000.

The previous prime is 647891141. The next prime is 647891147. The reversal of 647891145 is 541198746.

It is not a de Polignac number, because 647891145 - 2² = 647891141 is a prime.

It is a super-2 number, since 2×647891145² = 839525871538822050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 647891145.

It is not an unprimeable number, because it can be changed into a prime (647891141) 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 47 ways as a sum of consecutive naturals, for example, 116580 + ... + 122010.

It is an arithmetic number, because the mean of its divisors is an integer number (25633608).

Almost surely, 2^647891145 is an apocalyptic number.

It is an amenable number.

647891145 is a deficient number, since it is larger than the sum of its proper divisors (582522039).

647891145 is a wasteful number, since it uses less digits than its factorization.

647891145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694 (or 5691 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 647891145 is about 25453.7059187852. The cubic root of 647891145 is about 865.3012838916.

The spelling of 647891145 in words is "six hundred forty-seven million, eight hundred ninety-one thousand, one hundred forty-five".