647145 has 24 divisors (see below), whose sum is σ = 1142856. Its totient is φ = 338688.

The previous prime is 647131. The next prime is 647147. The reversal of 647145 is 541746.

647145 is a `hidden beast` number, since 647 + 14 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 393129 = 504^2 + 627^2 .

It is not a de Polignac number, because 647145 - 2⁵ = 647113 is a prime.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647145.

It is not an unprimeable number, because it can be changed into a prime (647147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3187 + ... + 3383.

It is an arithmetic number, because the mean of its divisors is an integer number (47619).

2⁶⁴⁷¹⁴⁵ is an apocalyptic number.

647145 is the 657-th pentagonal number.

It is an amenable number.

647145 is a deficient number, since it is larger than the sum of its proper divisors (495711).

647145 is a wasteful number, since it uses less digits than its factorization.

647145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 278 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 647145 is about 804.4532304615. The cubic root of 647145 is about 86.4968981034.

The spelling of 647145 in words is "six hundred forty-seven thousand, one hundred forty-five".