647222652 has 72 divisors (see below), whose sum is σ = 1666435680. Its totient is φ = 211760640.

The previous prime is 647222647. The next prime is 647222659. The reversal of 647222652 is 256222746.

647222652 is a `hidden beast` number, since 647 + 2 + 2 + 2 + 6 + 5 + 2 = 666.

It is a super-2 number, since 2×647222652² = 837794322523826208, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647222659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 799624 + ... + 800432.

It is an arithmetic number, because the mean of its divisors is an integer number (23144940).

Almost surely, 2^647222652 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 647222652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833217840).

647222652 is an abundant number, since it is smaller than the sum of its proper divisors (1019213028).

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

647222652 is a wasteful number, since it uses less digits than its factorization.

647222652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203 (or 1198 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 647222652 is about 25440.5709841584. The cubic root of 647222652 is about 865.0035760040.

The spelling of 647222652 in words is "six hundred forty-seven million, two hundred twenty-two thousand, six hundred fifty-two".