266015440 has 40 divisors (see below), whose sum is σ = 619913448. Its totient is φ = 106160640.

The previous prime is 266015437. The next prime is 266015443. The reversal of 266015440 is 44510662.

It is an interprime number because it is at equal distance from previous prime (266015437) and next prime (266015443).

It can be written as a sum of positive squares in 4 ways, for example, as 42094144 + 223921296 = 6488^2 + 14964^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 266015399 and 266015408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266015443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33274 + ... + 40486.

Almost surely, 2^266015440 is an apocalyptic number.

266015440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266015440 is an abundant number, since it is smaller than the sum of its proper divisors (353898008).

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

266015440 is a wasteful number, since it uses less digits than its factorization.

266015440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7687 (or 7681 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 266015440 is about 16309.9797670016. The cubic root of 266015440 is about 643.1352022749.

It can be divided in two parts, 26601 and 5440, that added together give a square (32041 = 179²).

The spelling of 266015440 in words is "two hundred sixty-six million, fifteen thousand, four hundred forty".