6651370728 has 96 divisors (see below), whose sum is σ = 18807516000. Its totient is φ = 2202147648.

The previous prime is 6651370721. The next prime is 6651370741. The reversal of 6651370728 is 8270731566.

6651370728 is a `hidden beast` number, since 66 + 513 + 7 + 0 + 72 + 8 = 666.

It is a super-2 number, since 2×6651370728² = 88481465122590499968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6651370721) 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, 278175 + ... + 301137.

It is an arithmetic number, because the mean of its divisors is an integer number (195911625).

Almost surely, 2^6651370728 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 6651370728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9403758000).

6651370728 is an abundant number, since it is smaller than the sum of its proper divisors (12156145272).

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

6651370728 is a wasteful number, since it uses less digits than its factorization.

6651370728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23133 (or 23117 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 6651370728 is about 81555.9361910585. The cubic root of 6651370728 is about 1880.6315525677.

The spelling of 6651370728 in words is "six billion, six hundred fifty-one million, three hundred seventy thousand, seven hundred twenty-eight".