647448025 has 27 divisors (see below), whose sum is σ = 935197119. Its totient is φ = 443353680.

The previous prime is 647448017. The next prime is 647448037. The reversal of 647448025 is 520844746.

It is a happy number.

The square root of 647448025 is 25445.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 233081289 + 414366736 = 15267^2 + 20356^2 .

It is not a de Polignac number, because 647448025 - 2³ = 647448017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 890212 + ... + 890938.

Almost surely, 2^647448025 is an apocalyptic number.

647448025 is the 25445-th square number.

647448025 is the 12723-rd centered octagonal number.

It is an amenable number.

647448025 is a deficient number, since it is larger than the sum of its proper divisors (287749094).

647448025 is an frugal number, since it uses more digits than its factorization.

647448025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 40.

The cubic root of 647448025 is about 865.1039669214.

The spelling of 647448025 in words is "six hundred forty-seven million, four hundred forty-eight thousand, twenty-five".