768613281 has 4 divisors (see below), whose sum is σ = 1024817712. Its totient is φ = 512408852.

The previous prime is 768613267. The next prime is 768613301. The reversal of 768613281 is 182316867.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 182316867 = 3 ⋅60772289.

It is a cyclic number.

It is not a de Polignac number, because 768613281 - 2⁶ = 768613217 is a prime.

It is a super-2 number, since 2×768613281² = 1181532751459169922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (768613381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128102211 + ... + 128102216.

It is an arithmetic number, because the mean of its divisors is an integer number (256204428).

Almost surely, 2^768613281 is an apocalyptic number.

It is an amenable number.

768613281 is a deficient number, since it is larger than the sum of its proper divisors (256204431).

768613281 is a wasteful number, since it uses less digits than its factorization.

768613281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256204430.

The product of its digits is 96768, while the sum is 42.

The square root of 768613281 is about 27723.8756489781. The cubic root of 768613281 is about 916.0150901228.

The spelling of 768613281 in words is "seven hundred sixty-eight million, six hundred thirteen thousand, two hundred eighty-one".