1266731790 has 16 divisors (see below), whose sum is σ = 3040156368. Its totient is φ = 337795136.

The previous prime is 1266731779. The next prime is 1266731813. The reversal of 1266731790 is 971376621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21112167 + ... + 21112226.

It is an arithmetic number, because the mean of its divisors is an integer number (190009773).

Almost surely, 2^1266731790 is an apocalyptic number.

1266731790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1266731790 is an abundant number, since it is smaller than the sum of its proper divisors (1773424578).

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

1266731790 is a wasteful number, since it uses less digits than its factorization.

1266731790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42224403.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 1266731790 is about 35591.1757321952. The cubic root of 1266731790 is about 1082.0023979410.

The spelling of 1266731790 in words is "one billion, two hundred sixty-six million, seven hundred thirty-one thousand, seven hundred ninety".