647140 has 48 divisors (see below), whose sum is σ = 1552320. Its totient is φ = 224640.

The previous prime is 647131. The next prime is 647147. The reversal of 647140 is 41746.

647140 = 66² + 67² + ... + 130².

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (647147) 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 15 ways as a sum of consecutive naturals, for example, 4875 + ... + 5005.

It is an arithmetic number, because the mean of its divisors is an integer number (32340).

2⁶⁴⁷¹⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776160).

647140 is an abundant number, since it is smaller than the sum of its proper divisors (905180).

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

647140 is a wasteful number, since it uses less digits than its factorization.

647140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 647140 is about 804.4501227547. The cubic root of 647140 is about 86.4966753375.

Adding to 647140 its reverse (41746), we get a palindrome (688886).

It can be divided in two parts, 6471 and 40, that multiplied together give a triangular number (258840 = T₇₁₉).

The spelling of 647140 in words is "six hundred forty-seven thousand, one hundred forty".