190128506 has 4 divisors (see below), whose sum is σ = 285192762. Its totient is φ = 95064252.

The previous prime is 190128473. The next prime is 190128517. The reversal of 190128506 is 605821091.

190128506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 142587481 + 47541025 = 11941^2 + 6895^2 .

It is a super-2 number, since 2×190128506² = 72297697587584072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47532125 + ... + 47532128.

Almost surely, 2^190128506 is an apocalyptic number.

190128506 is a deficient number, since it is larger than the sum of its proper divisors (95064256).

190128506 is an equidigital number, since it uses as much as digits as its factorization.

190128506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95064255.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 190128506 is about 13788.7093667246. The cubic root of 190128506 is about 575.0192870657.

Adding to 190128506 its reverse (605821091), we get a palindrome (795949597).

The spelling of 190128506 in words is "one hundred ninety million, one hundred twenty-eight thousand, five hundred six".