647468750 has 28 divisors (see below), whose sum is σ = 1214046960. Its totient is φ = 258975000.

The previous prime is 647468747. The next prime is 647468779. The reversal of 647468750 is 57864746.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 647468695 and 647468704.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 20891 + ... + 41609.

It is an arithmetic number, because the mean of its divisors is an integer number (43358820).

Almost surely, 2^647468750 is an apocalyptic number.

647468750 is a deficient number, since it is larger than the sum of its proper divisors (566578210).

647468750 is an frugal number, since it uses more digits than its factorization.

647468750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20751 (or 20726 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 47.

The square root of 647468750 is about 25445.4072476744. The cubic root of 647468750 is about 865.1131975663.

The spelling of 647468750 in words is "six hundred forty-seven million, four hundred sixty-eight thousand, seven hundred fifty".