191078730 has 128 divisors (see below), whose sum is σ = 541071360. Its totient is φ = 47900160.

The previous prime is 191078669. The next prime is 191078731. The reversal of 191078730 is 37870191.

191078730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×191078730² = 73022162116825800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191078731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 309382 + ... + 309998.

It is an arithmetic number, because the mean of its divisors is an integer number (4227120).

Almost surely, 2^191078730 is an apocalyptic number.

191078730 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 191078730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270535680).

191078730 is an abundant number, since it is smaller than the sum of its proper divisors (349992630).

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

191078730 is a wasteful number, since it uses less digits than its factorization.

191078730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 695 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 191078730 is about 13823.1230190576. The cubic root of 191078730 is about 575.9756391607.

The spelling of 191078730 in words is "one hundred ninety-one million, seventy-eight thousand, seven hundred thirty".