647311616 has 36 divisors (see below), whose sum is σ = 1476683712. Its totient is φ = 277418496.

The previous prime is 647311603. The next prime is 647311619. The reversal of 647311616 is 616113746.

It is not an unprimeable number, because it can be changed into a prime (647311619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178820 + ... + 182403.

It is an arithmetic number, because the mean of its divisors is an integer number (41018992).

Almost surely, 2^647311616 is an apocalyptic number.

It is an amenable number.

647311616 is an abundant number, since it is smaller than the sum of its proper divisors (829372096).

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

647311616 is an equidigital number, since it uses as much as digits as its factorization.

647311616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361246 (or 361232 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 647311616 is about 25442.3193911247. The cubic root of 647311616 is about 865.0432072150.

It can be divided in two parts, 64 and 7311616, that multiplied together give a square (467943424 = 21632²).

The spelling of 647311616 in words is "six hundred forty-seven million, three hundred eleven thousand, six hundred sixteen".