268248557 has 4 divisors (see below), whose sum is σ = 275498556. Its totient is φ = 260998560.

The previous prime is 268248551. The next prime is 268248571. The reversal of 268248557 is 755842862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755842862 = 2 ⋅377921431.

It can be written as a sum of positive squares in 2 ways, for example, as 162282121 + 105966436 = 12739^2 + 10294^2 .

It is a cyclic number.

It is not a de Polignac number, because 268248557 - 2⁶ = 268248493 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 (268248551) 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, 3624944 + ... + 3625017.

It is an arithmetic number, because the mean of its divisors is an integer number (68874639).

Almost surely, 2^268248557 is an apocalyptic number.

It is an amenable number.

268248557 is a deficient number, since it is larger than the sum of its proper divisors (7249999).

268248557 is an equidigital number, since it uses as much as digits as its factorization.

268248557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7249998.

The product of its digits is 1075200, while the sum is 47.

The square root of 268248557 is about 16378.2953020148. The cubic root of 268248557 is about 644.9298299162.

The spelling of 268248557 in words is "two hundred sixty-eight million, two hundred forty-eight thousand, five hundred fifty-seven".