647085625 has 20 divisors (see below), whose sum is σ = 817753860. Its totient is φ = 511808000.

The previous prime is 647085623. The next prime is 647085643. The reversal of 647085625 is 526580746.

It can be written as a sum of positive squares in 10 ways, for example, as 536015104 + 111070521 = 23152^2 + 10539^2 .

It is not a de Polignac number, because 647085625 - 2¹ = 647085623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647085623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49809 + ... + 61441.

It is an arithmetic number, because the mean of its divisors is an integer number (40887693).

Almost surely, 2^647085625 is an apocalyptic number.

It is an amenable number.

647085625 is a deficient number, since it is larger than the sum of its proper divisors (170668235).

647085625 is an equidigital number, since it uses as much as digits as its factorization.

647085625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11742 (or 11727 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The square root of 647085625 is about 25437.8777613228. The cubic root of 647085625 is about 864.9425268373.

The spelling of 647085625 in words is "six hundred forty-seven million, eighty-five thousand, six hundred twenty-five".