647238380 has 12 divisors (see below), whose sum is σ = 1359200640. Its totient is φ = 258895344.

The previous prime is 647238379. The next prime is 647238407. The reversal of 647238380 is 83832746.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16180940 + ... + 16180979.

It is an arithmetic number, because the mean of its divisors is an integer number (113266720).

Almost surely, 2^647238380 is an apocalyptic number.

It is an amenable number.

647238380 is an abundant number, since it is smaller than the sum of its proper divisors (711962260).

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

647238380 is a wasteful number, since it uses less digits than its factorization.

647238380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32361928 (or 32361926 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 647238380 is about 25440.8800948395. The cubic root of 647238380 is about 865.0105826943.

The spelling of 647238380 in words is "six hundred forty-seven million, two hundred thirty-eight thousand, three hundred eighty".