647888340 has 96 divisors (see below), whose sum is σ = 1983066624. Its totient is φ = 156741760.

The previous prime is 647888327. The next prime is 647888347. The reversal of 647888340 is 43888746.

It is a super-2 number, since 2×647888340² = 839518602215911200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 647888340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647888347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 545227 + ... + 546413.

It is an arithmetic number, because the mean of its divisors is an integer number (20656944).

Almost surely, 2^647888340 is an apocalyptic number.

647888340 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 647888340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991533312).

647888340 is an abundant number, since it is smaller than the sum of its proper divisors (1335178284).

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

647888340 is a wasteful number, since it uses less digits than its factorization.

647888340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037 (or 2035 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 48.

The square root of 647888340 is about 25453.6508186940. The cubic root of 647888340 is about 865.3000351357.

The spelling of 647888340 in words is "six hundred forty-seven million, eight hundred eighty-eight thousand, three hundred forty".