647405860 has 48 divisors (see below), whose sum is σ = 1451842560. Its totient is φ = 241960320.

The previous prime is 647405833. The next prime is 647405921. The reversal of 647405860 is 68504746.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24 + ... + 35983.

It is an arithmetic number, because the mean of its divisors is an integer number (30246720).

Almost surely, 2^647405860 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 647405860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725921280).

647405860 is an abundant number, since it is smaller than the sum of its proper divisors (804436700).

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

647405860 is a wasteful number, since it uses less digits than its factorization.

647405860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36076 (or 36074 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 647405860 is about 25444.1714347314. The cubic root of 647405860 is about 865.0851865718.

The spelling of 647405860 in words is "six hundred forty-seven million, four hundred five thousand, eight hundred sixty".