647720925 has 24 divisors (see below), whose sum is σ = 1127264160. Its totient is φ = 327268800.

The previous prime is 647720923. The next prime is 647720929. The reversal of 647720925 is 529027746.

It is not a de Polignac number, because 647720925 - 2¹ = 647720923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647720923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225846 + ... + 228695.

It is an arithmetic number, because the mean of its divisors is an integer number (46969340).

Almost surely, 2^647720925 is an apocalyptic number.

It is an amenable number.

647720925 is a deficient number, since it is larger than the sum of its proper divisors (479543235).

647720925 is a wasteful number, since it uses less digits than its factorization.

647720925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454573 (or 454568 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 647720925 is about 25450.3619817086. The cubic root of 647720925 is about 865.2254972481.

The spelling of 647720925 in words is "six hundred forty-seven million, seven hundred twenty thousand, nine hundred twenty-five".