647232173406 has 192 divisors, whose sum is σ = 1786273482240. Its totient is φ = 170090668800.

The previous prime is 647232173377. The next prime is 647232173407. The reversal of 647232173406 is 604371232746.

647232173406 is a `hidden beast` number, since 6 + 4 + 7 + 23 + 217 + 3 + 406 = 666.

647232173406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647232173407) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18060706 + ... + 18096506.

It is an arithmetic number, because the mean of its divisors is an integer number (9303507720).

Almost surely, 2^647232173406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647232173406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (893136741120).

647232173406 is an abundant number, since it is smaller than the sum of its proper divisors (1139041308834).

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

647232173406 is a wasteful number, since it uses less digits than its factorization.

647232173406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36128 (or 36109 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 45.

The spelling of 647232173406 in words is "six hundred forty-seven billion, two hundred thirty-two million, one hundred seventy-three thousand, four hundred six".