768621861 has 48 divisors (see below), whose sum is σ = 1307637760. Its totient is φ = 425930400.

The previous prime is 768621857. The next prime is 768621871. The reversal of 768621861 is 168126867.

It is a happy number.

768621861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 768621861 - 2² = 768621857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (768621871) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 408120 + ... + 409998.

Almost surely, 2^768621861 is an apocalyptic number.

It is an amenable number.

768621861 is a deficient number, since it is larger than the sum of its proper divisors (539015899).

768621861 is a wasteful number, since it uses less digits than its factorization.

768621861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086 (or 2083 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 768621861 is about 27724.0303888161. The cubic root of 768621861 is about 916.0184985903.

The spelling of 768621861 in words is "seven hundred sixty-eight million, six hundred twenty-one thousand, eight hundred sixty-one".