647203213 has 16 divisors (see below), whose sum is σ = 705126400. Its totient is φ = 591773040.

The previous prime is 647203211. The next prime is 647203217. The reversal of 647203213 is 312302746.

It is a cyclic number.

It is not a de Polignac number, because 647203213 - 2¹ = 647203211 is a prime.

It is a super-4 number, since 4×647203213⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647203211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257320 + ... + 259822.

It is an arithmetic number, because the mean of its divisors is an integer number (44070400).

Almost surely, 2^647203213 is an apocalyptic number.

It is an amenable number.

647203213 is a deficient number, since it is larger than the sum of its proper divisors (57923187).

647203213 is a wasteful number, since it uses less digits than its factorization.

647203213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 647203213 is about 25440.1889340469. The cubic root of 647203213 is about 864.9949159379.

Adding to 647203213 its reverse (312302746), we get a palindrome (959505959).

The spelling of 647203213 in words is "six hundred forty-seven million, two hundred three thousand, two hundred thirteen".