266649090 has 32 divisors (see below), whose sum is σ = 646301376. Its totient is φ = 70401600.

The previous prime is 266649083. The next prime is 266649101. The reversal of 266649090 is 90946662.

It is a super-2 number, since 2×266649090² = 142203474395656200, which contains 22 as substring.

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, 40972 + ... + 47031.

It is an arithmetic number, because the mean of its divisors is an integer number (20196918).

Almost surely, 2^266649090 is an apocalyptic number.

266649090 is an abundant number, since it is smaller than the sum of its proper divisors (379652286).

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

266649090 is a wasteful number, since it uses less digits than its factorization.

266649090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88114.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 266649090 is about 16329.3934363772. The cubic root of 266649090 is about 643.6454476888.

The spelling of 266649090 in words is "two hundred sixty-six million, six hundred forty-nine thousand, ninety".