647726976 has 192 divisors, whose sum is σ = 2071926000. Its totient is φ = 199120896.

The previous prime is 647726969. The next prime is 647726987. The reversal of 647726976 is 679627746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 583510 + ... + 584618.

Almost surely, 2^647726976 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 647726976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035963000).

647726976 is an abundant number, since it is smaller than the sum of its proper divisors (1424199024).

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

647726976 is a wasteful number, since it uses less digits than its factorization.

647726976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158 (or 1127 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 54.

The square root of 647726976 is about 25450.4808598973. The cubic root of 647726976 is about 865.2281915479.

The spelling of 647726976 in words is "six hundred forty-seven million, seven hundred twenty-six thousand, nine hundred seventy-six".