647974860 has 192 divisors, whose sum is σ = 2147281920. Its totient is φ = 144460800.

The previous prime is 647974813. The next prime is 647974861. The reversal of 647974860 is 68479746.

It is not an unprimeable number, because it can be changed into a prime (647974861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 339910 + ... + 341810.

It is an arithmetic number, because the mean of its divisors is an integer number (11183760).

Almost surely, 2^647974860 is an apocalyptic number.

647974860 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 647974860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073640960).

647974860 is an abundant number, since it is smaller than the sum of its proper divisors (1499307060).

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

647974860 is a wasteful number, since it uses less digits than its factorization.

647974860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1966 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The square root of 647974860 is about 25455.3503216907. The cubic root of 647974860 is about 865.3385512514.

The spelling of 647974860 in words is "six hundred forty-seven million, nine hundred seventy-four thousand, eight hundred sixty".