1646197728 has 144 divisors (see below), whose sum is σ = 5110079184. Its totient is φ = 462551040.

The previous prime is 1646197727. The next prime is 1646197757. The reversal of 1646197728 is 8277916461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646197727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284076 + ... + 289812.

It is an arithmetic number, because the mean of its divisors is an integer number (35486661).

Almost surely, 2^1646197728 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 1646197728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2555039592).

1646197728 is an abundant number, since it is smaller than the sum of its proper divisors (3463881456).

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

1646197728 is a wasteful number, since it uses less digits than its factorization.

1646197728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5825 (or 5810 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The square root of 1646197728 is about 40573.3622959695. The cubic root of 1646197728 is about 1180.7573726358.

The spelling of 1646197728 in words is "one billion, six hundred forty-six million, one hundred ninety-seven thousand, seven hundred twenty-eight".