191428216 has 32 divisors (see below), whose sum is σ = 412835040. Its totient is φ = 81514368.

The previous prime is 191428207. The next prime is 191428271. The reversal of 191428216 is 612824191.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2095 + ... + 19678.

It is an arithmetic number, because the mean of its divisors is an integer number (12901095).

Almost surely, 2^191428216 is an apocalyptic number.

It is an amenable number.

191428216 is an abundant number, since it is smaller than the sum of its proper divisors (221406824).

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

191428216 is a wasteful number, since it uses less digits than its factorization.

191428216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21943 (or 21939 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 191428216 is about 13835.7585986458. The cubic root of 191428216 is about 576.3265814531.

The spelling of 191428216 in words is "one hundred ninety-one million, four hundred twenty-eight thousand, two hundred sixteen".