268963781 has 4 divisors (see below), whose sum is σ = 277640064. Its totient is φ = 260287500.

The previous prime is 268963763. The next prime is 268963787. The reversal of 268963781 is 187369862.

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: 187369862 = 2 ⋅93684931.

It is a cyclic number.

It is not a de Polignac number, because 268963781 - 2¹⁴ = 268947397 is a prime.

It is a super-2 number, since 2×268963781² = 144683030979631922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268963787) 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, 4338095 + ... + 4338156.

It is an arithmetic number, because the mean of its divisors is an integer number (69410016).

Almost surely, 2^268963781 is an apocalyptic number.

It is an amenable number.

268963781 is a deficient number, since it is larger than the sum of its proper divisors (8676283).

268963781 is an equidigital number, since it uses as much as digits as its factorization.

268963781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8676282.

The product of its digits is 870912, while the sum is 50.

The square root of 268963781 is about 16400.1152739851. The cubic root of 268963781 is about 645.5025076687.

The spelling of 268963781 in words is "two hundred sixty-eight million, nine hundred sixty-three thousand, seven hundred eighty-one".