190428643 has 4 divisors (see below), whose sum is σ = 192723048. Its totient is φ = 188134240.

The previous prime is 190428619. The next prime is 190428683. The reversal of 190428643 is 346824091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 190428643 - 2⁹ = 190428131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190428683) 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 3 ways as a sum of consecutive naturals, for example, 1147078 + ... + 1147243.

It is an arithmetic number, because the mean of its divisors is an integer number (48180762).

Almost surely, 2^190428643 is an apocalyptic number.

190428643 is a deficient number, since it is larger than the sum of its proper divisors (2294405).

190428643 is an equidigital number, since it uses as much as digits as its factorization.

190428643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294404.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 190428643 is about 13799.5885083578. The cubic root of 190428643 is about 575.3217032804.

The spelling of 190428643 in words is "one hundred ninety million, four hundred twenty-eight thousand, six hundred forty-three".