266978890 has 12 divisors (see below), whose sum is σ = 480655026. Its totient is φ = 106770888.

The previous prime is 266978837. The next prime is 266978891. The reversal of 266978890 is 98879662.

It can be written as a sum of positive squares in only one way, i.e., 240281001 + 26697889 = 15501^2 + 5167^2 .

It is not an unprimeable number, because it can be changed into a prime (266978891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49087 + ... + 54253.

Almost surely, 2^266978890 is an apocalyptic number.

266978890 is a deficient number, since it is larger than the sum of its proper divisors (213676136).

266978890 is an frugal number, since it uses more digits than its factorization.

266978890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10341 (or 5174 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 266978890 is about 16339.4886700900. The cubic root of 266978890 is about 643.9106986883.

The spelling of 266978890 in words is "two hundred sixty-six million, nine hundred seventy-eight thousand, eight hundred ninety".