647084640 has 192 divisors, whose sum is σ = 2112397056. Its totient is φ = 166397952.

The previous prime is 647084609. The next prime is 647084657. The reversal of 647084640 is 46480746.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 2208334 + ... + 2208626.

It is an arithmetic number, because the mean of its divisors is an integer number (11002068).

Almost surely, 2^647084640 is an apocalyptic number.

647084640 is a gapful number since it is divisible by the number (60) 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 647084640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056198528).

647084640 is an abundant number, since it is smaller than the sum of its proper divisors (1465312416).

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

647084640 is a wasteful number, since it uses less digits than its factorization.

647084640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 647084640 is about 25437.8584004236. The cubic root of 647084640 is about 864.9420879624.

The spelling of 647084640 in words is "six hundred forty-seven million, eighty-four thousand, six hundred forty".