191080890 has 384 divisors, whose sum is σ = 703261440. Its totient is φ = 36288000.

The previous prime is 191080859. The next prime is 191080919. The reversal of 191080890 is 98080191.

191080890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1891840 + ... + 1891940.

It is an arithmetic number, because the mean of its divisors is an integer number (1831410).

Almost surely, 2^191080890 is an apocalyptic number.

191080890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 191080890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (351630720).

191080890 is an abundant number, since it is smaller than the sum of its proper divisors (512180550).

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

191080890 is a wasteful number, since it uses less digits than its factorization.

191080890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 191080890 is about 13823.2011487933. The cubic root of 191080890 is about 575.9778094750.

The spelling of 191080890 in words is "one hundred ninety-one million, eighty thousand, eight hundred ninety".