647667348440 has 128 divisors (see below), whose sum is σ = 1763829043200. Its totient is φ = 208943953920.

The previous prime is 647667348431. The next prime is 647667348451. The reversal of 647667348440 is 44843766746.

It is a self number, because there is not a number n which added to its sum of digits gives 647667348440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22638545 + ... + 22667135.

It is an arithmetic number, because the mean of its divisors is an integer number (13779914400).

Almost surely, 2^647667348440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647667348440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881914521600).

647667348440 is an abundant number, since it is smaller than the sum of its proper divisors (1116161694760).

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

647667348440 is a wasteful number, since it uses less digits than its factorization.

647667348440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33385 (or 33381 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 59.

The spelling of 647667348440 in words is "six hundred forty-seven billion, six hundred sixty-seven million, three hundred forty-eight thousand, four hundred forty".