647720448 has 160 divisors (see below), whose sum is σ = 1818550272. Its totient is φ = 204595200.

The previous prime is 647720429. The next prime is 647720453. The reversal of 647720448 is 844027746.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2904465 + ... + 2904687.

Almost surely, 2^647720448 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 647720448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909275136).

647720448 is an abundant number, since it is smaller than the sum of its proper divisors (1170829824).

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

647720448 is a wasteful number, since it uses less digits than its factorization.

647720448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 42.

The square root of 647720448 is about 25450.3526105239. The cubic root of 647720448 is about 865.2252848559.

The spelling of 647720448 in words is "six hundred forty-seven million, seven hundred twenty thousand, four hundred forty-eight".