768369781 has 2 divisors, whose sum is σ = 768369782. Its totient is φ = 768369780.

The previous prime is 768369769. The next prime is 768369821. The reversal of 768369781 is 187963867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594920881 + 173448900 = 24391^2 + 13170^2 .

It is a cyclic number.

It is not a de Polignac number, because 768369781 - 2¹⁹ = 767845493 is a prime.

It is a super-2 number, since 2×768369781² = 1180784240707975922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768367781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384184890 + 384184891.

It is an arithmetic number, because the mean of its divisors is an integer number (384184891).

Almost surely, 2^768369781 is an apocalyptic number.

It is an amenable number.

768369781 is a deficient number, since it is larger than the sum of its proper divisors (1).

768369781 is an equidigital number, since it uses as much as digits as its factorization.

768369781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 768369781 is about 27719.4837794646. The cubic root of 768369781 is about 915.9183473964.

The spelling of 768369781 in words is "seven hundred sixty-eight million, three hundred sixty-nine thousand, seven hundred eighty-one".