647002240 has 64 divisors (see below), whose sum is σ = 1596683520. Its totient is φ = 250444800.

The previous prime is 647002189. The next prime is 647002243. The reversal of 647002240 is 42200746.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×647002240² = 837223797130035200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647002243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3535 + ... + 36145.

It is an arithmetic number, because the mean of its divisors is an integer number (24948180).

Almost surely, 2^647002240 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 647002240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798341760).

647002240 is an abundant number, since it is smaller than the sum of its proper divisors (949681280).

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

647002240 is a wasteful number, since it uses less digits than its factorization.

647002240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32661 (or 32649 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 647002240 is about 25436.2387156592. The cubic root of 647002240 is about 864.9053723876.

Adding to 647002240 its reverse (42200746), we get a palindrome (689202986).

The spelling of 647002240 in words is "six hundred forty-seven million, two thousand, two hundred forty".