189621648 has 80 divisors (see below), whose sum is σ = 551105600. Its totient is φ = 63195552.

The previous prime is 189621647. The next prime is 189621671. The reversal of 189621648 is 846126981.

189621648 is a `hidden beast` number, since 18 + 9 + 621 + 6 + 4 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (189621643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32283 + ... + 37701.

It is an arithmetic number, because the mean of its divisors is an integer number (6888820).

Almost surely, 2^189621648 is an apocalyptic number.

189621648 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 189621648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275552800).

189621648 is an abundant number, since it is smaller than the sum of its proper divisors (361483952).

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

189621648 is an frugal number, since it uses more digits than its factorization.

189621648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448 (or 5424 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 189621648 is about 13770.3176433952. The cubic root of 189621648 is about 574.5078566507.

The spelling of 189621648 in words is "one hundred eighty-nine million, six hundred twenty-one thousand, six hundred forty-eight".