768397538 has 4 divisors (see below), whose sum is σ = 1152596310. Its totient is φ = 384198768.

The previous prime is 768397499. The next prime is 768397583. The reversal of 768397538 is 835793867.

It is a happy number.

768397538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835793867 = 331 ⋅2525057.

It can be written as a sum of positive squares in only one way, i.e., 554272849 + 214124689 = 23543^2 + 14633^2 .

It is a super-2 number, since 2×768397538² = 1180869552808922888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192099383 + ... + 192099386.

Almost surely, 2^768397538 is an apocalyptic number.

768397538 is a deficient number, since it is larger than the sum of its proper divisors (384198772).

768397538 is a wasteful number, since it uses less digits than its factorization.

768397538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384198771.

The product of its digits is 7620480, while the sum is 56.

The square root of 768397538 is about 27719.9844516551. The cubic root of 768397538 is about 915.9293763047.

The spelling of 768397538 in words is "seven hundred sixty-eight million, three hundred ninety-seven thousand, five hundred thirty-eight".