266428388 has 12 divisors (see below), whose sum is σ = 466730880. Its totient is φ = 133076712.

The previous prime is 266428367. The next prime is 266428397. The reversal of 266428388 is 883824662.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29948 + ... + 37811.

It is an arithmetic number, because the mean of its divisors is an integer number (38894240).

Almost surely, 2^266428388 is an apocalyptic number.

It is an amenable number.

266428388 is a deficient number, since it is larger than the sum of its proper divisors (200302492).

266428388 is a wasteful number, since it uses less digits than its factorization.

266428388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68746 (or 68744 counting only the distinct ones).

The product of its digits is 884736, while the sum is 47.

The square root of 266428388 is about 16322.6342236785. The cubic root of 266428388 is about 643.4678196713.

The spelling of 266428388 in words is "two hundred sixty-six million, four hundred twenty-eight thousand, three hundred eighty-eight".