647238378 has 32 divisors (see below), whose sum is σ = 1323241920. Its totient is φ = 210990080.

The previous prime is 647238353. The next prime is 647238379. The reversal of 647238378 is 873832746.

It is not an unprimeable number, because it can be changed into a prime (647238379) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 65098 + ... + 74378.

It is an arithmetic number, because the mean of its divisors is an integer number (41351310).

Almost surely, 2^647238378 is an apocalyptic number.

647238378 is an abundant number, since it is smaller than the sum of its proper divisors (676003542).

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

647238378 is a wasteful number, since it uses less digits than its factorization.

647238378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9542.

The product of its digits is 1354752, while the sum is 48.

The square root of 647238378 is about 25440.8800555327. The cubic root of 647238378 is about 865.0105818033.

It can be divided in two parts, 6472 and 38378, that added together give a triangular number (44850 = T₂₉₉).

The spelling of 647238378 in words is "six hundred forty-seven million, two hundred thirty-eight thousand, three hundred seventy-eight".