1660393728 has 504 divisors, whose sum is σ = 6005239296. Its totient is φ = 447897600.

The previous prime is 1660393673. The next prime is 1660393729. The reversal of 1660393728 is 8273930661.

1660393728 is a `hidden beast` number, since 1 + 6 + 603 + 9 + 37 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660393729) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 40497388 + ... + 40497428.

Almost surely, 2^1660393728 is an apocalyptic number.

1660393728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660393728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3002619648).

1660393728 is an abundant number, since it is smaller than the sum of its proper divisors (4344845568).

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

1660393728 is an frugal number, since it uses more digits than its factorization.

1660393728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1660393728 is about 40747.9291252942. The cubic root of 1660393728 is about 1184.1417531766.

The spelling of 1660393728 in words is "one billion, six hundred sixty million, three hundred ninety-three thousand, seven hundred twenty-eight".