1659221928 has 384 divisors, whose sum is σ = 5975424000. Its totient is φ = 422392320.

The previous prime is 1659221917. The next prime is 1659221999. The reversal of 1659221928 is 8291229561.

It is a happy number.

1659221928 is a `hidden beast` number, since 16 + 592 + 21 + 9 + 28 = 666.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 4265158 + ... + 4265546.

It is an arithmetic number, because the mean of its divisors is an integer number (15561000).

Almost surely, 2^1659221928 is an apocalyptic number.

1659221928 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 1659221928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2987712000).

1659221928 is an abundant number, since it is smaller than the sum of its proper divisors (4316202072).

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

1659221928 is a wasteful number, since it uses less digits than its factorization.

1659221928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 445 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1659221928 is about 40733.5479426971. The cubic root of 1659221928 is about 1183.8631237101.

The spelling of 1659221928 in words is "one billion, six hundred fifty-nine million, two hundred twenty-one thousand, nine hundred twenty-eight".