266256440 has 32 divisors (see below), whose sum is σ = 615271680. Its totient is φ = 103623552.

The previous prime is 266256437. The next prime is 266256449. The reversal of 266256440 is 44652662.

266256440 = 353² + 354² + ... + 944².

It is a self number, because there is not a number n which added to its sum of digits gives 266256440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266256449) 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, 88472 + ... + 91431.

It is an arithmetic number, because the mean of its divisors is an integer number (19227240).

Almost surely, 2^266256440 is an apocalyptic number.

266256440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266256440 is an abundant number, since it is smaller than the sum of its proper divisors (349015240).

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

266256440 is a wasteful number, since it uses less digits than its factorization.

266256440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179951 (or 179947 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 266256440 is about 16317.3662090424. The cubic root of 266256440 is about 643.3293624341.

The spelling of 266256440 in words is "two hundred sixty-six million, two hundred fifty-six thousand, four hundred forty".