647748 has 36 divisors (see below), whose sum is σ = 1725360. Its totient is φ = 204336.

The previous prime is 647747. The next prime is 647753. The reversal of 647748 is 847746.

It is a happy number.

647748 is a `hidden beast` number, since 647 + 7 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (647741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211 + ... + 1157.

2⁶⁴⁷⁷⁴⁸ 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 647748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862680).

647748 is an abundant number, since it is smaller than the sum of its proper divisors (1077612).

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

647748 is a wasteful number, since it uses less digits than its factorization.

647748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 971 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 647748 is about 804.8279319209. The cubic root of 647748 is about 86.5237552674.

The spelling of 647748 in words is "six hundred forty-seven thousand, seven hundred forty-eight".