191078040 has 128 divisors (see below), whose sum is σ = 596574720. Its totient is φ = 48921600.

The previous prime is 191078029. The next prime is 191078059. The reversal of 191078040 is 40870191.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 191077989 and 191078007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 349047 + ... + 349593.

It is an arithmetic number, because the mean of its divisors is an integer number (4660740).

Almost surely, 2^191078040 is an apocalyptic number.

191078040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191078040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298287360).

191078040 is an abundant number, since it is smaller than the sum of its proper divisors (405496680).

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

191078040 is a wasteful number, since it uses less digits than its factorization.

191078040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 191078040 is about 13823.0980608545. The cubic root of 191078040 is about 575.9749458624.

The spelling of 191078040 in words is "one hundred ninety-one million, seventy-eight thousand, forty".