191568040 has 16 divisors (see below), whose sum is σ = 431028180. Its totient is φ = 76627200.

The previous prime is 191567977. The next prime is 191568049. The reversal of 191568040 is 40865191.

It can be written as a sum of positive squares in 2 ways, for example, as 162256644 + 29311396 = 12738^2 + 5414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191567987 and 191568005.

It is not an unprimeable number, because it can be changed into a prime (191568049) 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 3 ways as a sum of consecutive naturals, for example, 2394561 + ... + 2394640.

Almost surely, 2^191568040 is an apocalyptic number.

191568040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191568040 is an abundant number, since it is smaller than the sum of its proper divisors (239460140).

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

191568040 is a wasteful number, since it uses less digits than its factorization.

191568040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4789212 (or 4789208 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 191568040 is about 13840.8106698994. The cubic root of 191568040 is about 576.4668684622.

The spelling of 191568040 in words is "one hundred ninety-one million, five hundred sixty-eight thousand, forty".