6620254128 has 120 divisors (see below), whose sum is σ = 19453254912. Its totient is φ = 2097684864.

The previous prime is 6620253989. The next prime is 6620254129. The reversal of 6620254128 is 8214520266.

It is a happy number.

6620254128 is a `hidden beast` number, since 6 + 620 + 2 + 5 + 4 + 1 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6620254092 and 6620254101.

It is not an unprimeable number, because it can be changed into a prime (6620254129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 533725 + ... + 545987.

Almost surely, 2^6620254128 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 6620254128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9726627456).

6620254128 is an abundant number, since it is smaller than the sum of its proper divisors (12833000784).

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

6620254128 is a wasteful number, since it uses less digits than its factorization.

6620254128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12463 (or 12454 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 6620254128 is about 81364.9440975658. The cubic root of 6620254128 is about 1877.6942957298.

The spelling of 6620254128 in words is "six billion, six hundred twenty million, two hundred fifty-four thousand, one hundred twenty-eight".