647298432 has 128 divisors (see below), whose sum is σ = 2084227200. Its totient is φ = 196139520.

The previous prime is 647298413. The next prime is 647298439. The reversal of 647298432 is 234892746.

647298432 is a `hidden beast` number, since 64 + 72 + 98 + 432 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647298439) 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, 29503 + ... + 46529.

It is an arithmetic number, because the mean of its divisors is an integer number (16283025).

Almost surely, 2^647298432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647298432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1042113600).

647298432 is an abundant number, since it is smaller than the sum of its proper divisors (1436928768).

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

647298432 is a wasteful number, since it uses less digits than its factorization.

647298432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17061 (or 17043 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 647298432 is about 25442.0602939306. The cubic root of 647298432 is about 865.0373343058.

The spelling of 647298432 in words is "six hundred forty-seven million, two hundred ninety-eight thousand, four hundred thirty-two".