768421091 has 4 divisors (see below), whose sum is σ = 794918400. Its totient is φ = 741923784.

The previous prime is 768421061. The next prime is 768421117. The reversal of 768421091 is 190124867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190124867 = 2237 ⋅84991.

It is a cyclic number.

It is not a de Polignac number, because 768421091 - 2¹⁸ = 768158947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (768421061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13248611 + ... + 13248668.

It is an arithmetic number, because the mean of its divisors is an integer number (198729600).

Almost surely, 2^768421091 is an apocalyptic number.

768421091 is a deficient number, since it is larger than the sum of its proper divisors (26497309).

768421091 is a wasteful number, since it uses less digits than its factorization.

768421091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26497308.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 768421091 is about 27720.4092863002. The cubic root of 768421091 is about 915.9387345961.

The spelling of 768421091 in words is "seven hundred sixty-eight million, four hundred twenty-one thousand, ninety-one".