266981890 has 24 divisors (see below), whose sum is σ = 559028412. Its totient is φ = 91536480.

The previous prime is 266981879. The next prime is 266981909. The reversal of 266981890 is 98189662.

It is a happy number.

266981890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 232654009 + 34327881 = 15253^2 + 5859^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271941 + ... + 272920.

Almost surely, 2^266981890 is an apocalyptic number.

266981890 is an abundant number, since it is smaller than the sum of its proper divisors (292046522).

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

266981890 is a wasteful number, since it uses less digits than its factorization.

266981890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544882 (or 544875 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 266981890 is about 16339.5804719705. The cubic root of 266981890 is about 643.9131105205.

The spelling of 266981890 in words is "two hundred sixty-six million, nine hundred eighty-one thousand, eight hundred ninety".