647393280 has 208 divisors, whose sum is σ = 2130184224. Its totient is φ = 167772160.

The previous prime is 647393267. The next prime is 647393281. The reversal of 647393280 is 82393746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647393281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2518912 + ... + 2519168.

Almost surely, 2^647393280 is an apocalyptic number.

647393280 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 647393280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1065092112).

647393280 is an abundant number, since it is smaller than the sum of its proper divisors (1482790944).

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

647393280 is a wasteful number, since it uses less digits than its factorization.

647393280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 647393280 is about 25443.9242256378. The cubic root of 647393280 is about 865.0795832644.

The spelling of 647393280 in words is "six hundred forty-seven million, three hundred ninety-three thousand, two hundred eighty".