266253988 has 96 divisors (see below), whose sum is σ = 647458560. Its totient is φ = 92413440.

The previous prime is 266253931. The next prime is 266253989. The reversal of 266253988 is 889352662.

It is a super-2 number, since 2×266253988² = 141782372251808288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266253989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114970 + ... + 117262.

It is an arithmetic number, because the mean of its divisors is an integer number (6744360).

Almost surely, 2^266253988 is an apocalyptic number.

266253988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266253988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323729280).

266253988 is an abundant number, since it is smaller than the sum of its proper divisors (381204572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266253988 is a wasteful number, since it uses less digits than its factorization.

266253988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357 (or 2355 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 266253988 is about 16317.2910741949. The cubic root of 266253988 is about 643.3273875856.

It can be divided in two parts, 2662539 and 88, that multiplied together give a palindrome (234303432).

The spelling of 266253988 in words is "two hundred sixty-six million, two hundred fifty-three thousand, nine hundred eighty-eight".