266058640 has 20 divisors (see below), whose sum is σ = 618586524. Its totient is φ = 106423424.

The previous prime is 266058629. The next prime is 266058643. The reversal of 266058640 is 46850662.

It can be written as a sum of positive squares in 2 ways, for example, as 27541504 + 238517136 = 5248^2 + 15444^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 266058640.

It is not an unprimeable number, because it can be changed into a prime (266058643) 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, 1662787 + ... + 1662946.

Almost surely, 2^266058640 is an apocalyptic number.

266058640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266058640 is an abundant number, since it is smaller than the sum of its proper divisors (352527884).

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

266058640 is a wasteful number, since it uses less digits than its factorization.

266058640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325746 (or 3325740 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 266058640 is about 16311.3040557768. The cubic root of 266058640 is about 643.1700147115.

It can be divided in two parts, 26605 and 8640, that added together give a triangular number (35245 = T₂₆₅).

The spelling of 266058640 in words is "two hundred sixty-six million, fifty-eight thousand, six hundred forty".