266991632 has 40 divisors (see below), whose sum is σ = 543964440. Its totient is φ = 126766080.

The previous prime is 266991611. The next prime is 266991649. The reversal of 266991632 is 236199662.

It can be written as a sum of positive squares in 4 ways, for example, as 10863616 + 256128016 = 3296^2 + 16004^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23588 + ... + 33020.

It is an arithmetic number, because the mean of its divisors is an integer number (13599111).

Almost surely, 2^266991632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266991632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271982220).

266991632 is an abundant number, since it is smaller than the sum of its proper divisors (276972808).

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

266991632 is a wasteful number, since it uses less digits than its factorization.

266991632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9531 (or 9525 counting only the distinct ones).

The product of its digits is 209952, while the sum is 44.

The square root of 266991632 is about 16339.8785797202. The cubic root of 266991632 is about 643.9209424190.

The spelling of 266991632 in words is "two hundred sixty-six million, nine hundred ninety-one thousand, six hundred thirty-two".