266312620 has 48 divisors (see below), whose sum is σ = 642781440. Its totient is φ = 90788544.

The previous prime is 266312611. The next prime is 266312639. The reversal of 266312620 is 26213662.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19747 + ... + 30373.

It is an arithmetic number, because the mean of its divisors is an integer number (13391280).

Almost surely, 2^266312620 is an apocalyptic number.

266312620 is a gapful number since it is divisible by the number (20) 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 266312620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321390720).

266312620 is an abundant number, since it is smaller than the sum of its proper divisors (376468820).

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

266312620 is a wasteful number, since it uses less digits than its factorization.

266312620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10822 (or 10820 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 266312620 is about 16319.0875970441. The cubic root of 266312620 is about 643.3746066629.

The spelling of 266312620 in words is "two hundred sixty-six million, three hundred twelve thousand, six hundred twenty".