268786021 has 6 divisors (see below), whose sum is σ = 312669510. Its totient is φ = 230387976.

The previous prime is 268786013. The next prime is 268786057. The reversal of 268786021 is 120687862.

It can be written as a sum of positive squares in only one way, i.e., 210569121 + 58216900 = 14511^2 + 7630^2 .

It is not a de Polignac number, because 268786021 - 2³ = 268786013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268786061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2742666 + ... + 2742763.

It is an arithmetic number, because the mean of its divisors is an integer number (52111585).

Almost surely, 2^268786021 is an apocalyptic number.

It is an amenable number.

268786021 is a deficient number, since it is larger than the sum of its proper divisors (43883489).

268786021 is an equidigital number, since it uses as much as digits as its factorization.

268786021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485443 (or 5485436 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 268786021 is about 16394.6949041451. The cubic root of 268786021 is about 645.3602706568.

The spelling of 268786021 in words is "two hundred sixty-eight million, seven hundred eighty-six thousand, twenty-one".