647351672 has 64 divisors (see below), whose sum is σ = 1372723200. Its totient is φ = 283536000.

The previous prime is 647351671. The next prime is 647351681. The reversal of 647351672 is 276153746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647351671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 979022 + ... + 979682.

It is an arithmetic number, because the mean of its divisors is an integer number (21448800).

Almost surely, 2^647351672 is an apocalyptic number.

647351672 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647351672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686361600).

647351672 is an abundant number, since it is smaller than the sum of its proper divisors (725371528).

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

647351672 is a wasteful number, since it uses less digits than its factorization.

647351672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1064 counting only the distinct ones).

The product of its digits is 211680, while the sum is 41.

The square root of 647351672 is about 25443.1065713289. The cubic root of 647351672 is about 865.0610499640.

The spelling of 647351672 in words is "six hundred forty-seven million, three hundred fifty-one thousand, six hundred seventy-two".