647227944 has 192 divisors, whose sum is σ = 2065227840. Its totient is φ = 180910080.

The previous prime is 647227943. The next prime is 647227963. The reversal of 647227944 is 449722746.

It is a super-2 number, since 2×647227944² = 837808022988934272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647227944.

It is not an unprimeable number, because it can be changed into a prime (647227943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 713139 + ... + 714045.

It is an arithmetic number, because the mean of its divisors is an integer number (10756395).

Almost surely, 2^647227944 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 647227944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1032613920).

647227944 is an abundant number, since it is smaller than the sum of its proper divisors (1417999896).

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

647227944 is a wasteful number, since it uses less digits than its factorization.

647227944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000 (or 993 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 647227944 is about 25440.6749910453. The cubic root of 647227944 is about 865.0059335577.

The spelling of 647227944 in words is "six hundred forty-seven million, two hundred twenty-seven thousand, nine hundred forty-four".