647140520 has 32 divisors (see below), whose sum is σ = 1568072520. Its totient is φ = 238944000.

The previous prime is 647140511. The next prime is 647140523. The reversal of 647140520 is 25041746.

It can be written as a sum of positive squares in 4 ways, for example, as 325225156 + 321915364 = 18034^2 + 17942^2 .

It is not an unprimeable number, because it can be changed into a prime (647140523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621731 + ... + 622770.

Almost surely, 2^647140520 is an apocalyptic number.

It is an amenable number.

647140520 is an abundant number, since it is smaller than the sum of its proper divisors (920932000).

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

647140520 is a wasteful number, since it uses less digits than its factorization.

647140520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244525 (or 1244521 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 647140520 is about 25438.9567396149. The cubic root of 647140520 is about 864.9669850520.

The spelling of 647140520 in words is "six hundred forty-seven million, one hundred forty thousand, five hundred twenty".