647128092 has 192 divisors, whose sum is σ = 1792336896. Its totient is φ = 180111360.

The previous prime is 647128067. The next prime is 647128099. The reversal of 647128092 is 290821746.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 647128092.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647128099) 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, 7796683 + ... + 7796765.

It is an arithmetic number, because the mean of its divisors is an integer number (9335088).

Almost surely, 2^647128092 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 647128092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896168448).

647128092 is an abundant number, since it is smaller than the sum of its proper divisors (1145208804).

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

647128092 is a wasteful number, since it uses less digits than its factorization.

647128092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 647128092 is about 25438.7124674186. The cubic root of 647128092 is about 864.9614479349.

The spelling of 647128092 in words is "six hundred forty-seven million, one hundred twenty-eight thousand, ninety-two".