647688704 has 160 divisors (see below), whose sum is σ = 1492237824. Its totient is φ = 278691840.

The previous prime is 647688677. The next prime is 647688731. The reversal of 647688704 is 407886746.

It is an interprime number because it is at equal distance from previous prime (647688677) and next prime (647688731).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8872412 + ... + 8872484.

Almost surely, 2^647688704 is an apocalyptic number.

647688704 is a gapful number since it is divisible by the number (64) 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 647688704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746118912).

647688704 is an abundant number, since it is smaller than the sum of its proper divisors (844549120).

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

647688704 is a wasteful number, since it uses less digits than its factorization.

647688704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 50.

The square root of 647688704 is about 25449.7289572993. The cubic root of 647688704 is about 865.2111500748.

The spelling of 647688704 in words is "six hundred forty-seven million, six hundred eighty-eight thousand, seven hundred four".