647449725 has 72 divisors (see below), whose sum is σ = 1192902816. Its totient is φ = 308016000.

The previous prime is 647449711. The next prime is 647449727. The reversal of 647449725 is 527944746.

It is not a de Polignac number, because 647449725 - 2⁶ = 647449661 is a prime.

It is a super-2 number, since 2×647449725² = 838382292805151250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647449727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 936630 + ... + 937320.

Almost surely, 2^647449725 is an apocalyptic number.

647449725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

647449725 is a deficient number, since it is larger than the sum of its proper divisors (545453091).

647449725 is a wasteful number, since it uses less digits than its factorization.

647449725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 743 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 48.

The square root of 647449725 is about 25445.0334053622. The cubic root of 647449725 is about 865.1047240866.

The spelling of 647449725 in words is "six hundred forty-seven million, four hundred forty-nine thousand, seven hundred twenty-five".