647171448 has 128 divisors (see below), whose sum is σ = 2050583040. Its totient is φ = 165312000.

The previous prime is 647171411. The next prime is 647171479. The reversal of 647171448 is 844171746.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109858 + ... + 115598.

It is an arithmetic number, because the mean of its divisors is an integer number (16020180).

Almost surely, 2^647171448 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 647171448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025291520).

647171448 is an abundant number, since it is smaller than the sum of its proper divisors (1403411592).

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

647171448 is a wasteful number, since it uses less digits than its factorization.

647171448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5829 (or 5825 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 647171448 is about 25439.5646189159. The cubic root of 647171448 is about 864.9807642709.

The spelling of 647171448 in words is "six hundred forty-seven million, one hundred seventy-one thousand, four hundred forty-eight".