647693280 has 384 divisors, whose sum is σ = 2574028800. Its totient is φ = 150792192.

The previous prime is 647693273. The next prime is 647693281. The reversal of 647693280 is 82396746.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647693281) 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 63 ways as a sum of consecutive naturals, for example, 1066737 + ... + 1067343.

It is an arithmetic number, because the mean of its divisors is an integer number (6703200).

Almost surely, 2^647693280 is an apocalyptic number.

647693280 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 647693280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287014400).

647693280 is an abundant number, since it is smaller than the sum of its proper divisors (1926335520).

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

647693280 is a wasteful number, since it uses less digits than its factorization.

647693280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 647693280 is about 25449.8188598662. The cubic root of 647693280 is about 865.2131876776.

The spelling of 647693280 in words is "six hundred forty-seven million, six hundred ninety-three thousand, two hundred eighty".