647220000 has 480 divisors, whose sum is σ = 2569577472. Its totient is φ = 139392000.

The previous prime is 647219983. The next prime is 647220011. The reversal of 647220000 is 22746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (21).

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 79 ways as a sum of consecutive naturals, for example, 9659967 + ... + 9660033.

Almost surely, 2^647220000 is an apocalyptic number.

647220000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1284788736).

647220000 is an abundant number, since it is smaller than the sum of its proper divisors (1922357472).

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

647220000 is a wasteful number, since it uses less digits than its factorization.

647220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 647220000 is about 25440.5188626333. The cubic root of 647220000 is about 865.0023945494.

Adding to 647220000 its reverse (22746), we get a palindrome (647242746).

The spelling of 647220000 in words is "six hundred forty-seven million, two hundred twenty thousand".