190621728 has 192 divisors, whose sum is σ = 627056640. Its totient is φ = 55814400.

The previous prime is 190621703. The next prime is 190621733. The reversal of 190621728 is 827126091.

190621728 is a `hidden beast` number, since 1 + 9 + 0 + 621 + 7 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 190621692 and 190621701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294301 + ... + 294947.

It is an arithmetic number, because the mean of its divisors is an integer number (3265920).

Almost surely, 2^190621728 is an apocalyptic number.

190621728 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 190621728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313528320).

190621728 is an abundant number, since it is smaller than the sum of its proper divisors (436434912).

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

190621728 is a wasteful number, since it uses less digits than its factorization.

190621728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 190621728 is about 13806.5827777912. The cubic root of 190621728 is about 575.5160866205.

The spelling of 190621728 in words is "one hundred ninety million, six hundred twenty-one thousand, seven hundred twenty-eight".