647629728 has 48 divisors (see below), whose sum is σ = 1702796256. Its totient is φ = 215525120.

The previous prime is 647629721. The next prime is 647629753. The reversal of 647629728 is 827926746.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (647629721) 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, 57523 + ... + 67853.

It is an arithmetic number, because the mean of its divisors is an integer number (35474922).

Almost surely, 2^647629728 is an apocalyptic number.

It is an amenable number.

647629728 is an abundant number, since it is smaller than the sum of its proper divisors (1055166528).

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

647629728 is a wasteful number, since it uses less digits than its factorization.

647629728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10997 (or 10989 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 51.

The square root of 647629728 is about 25448.5702545349. The cubic root of 647629728 is about 865.1848883633.

The spelling of 647629728 in words is "six hundred forty-seven million, six hundred twenty-nine thousand, seven hundred twenty-eight".