266961864 has 128 divisors (see below), whose sum is σ = 743702400. Its totient is φ = 79822080.

The previous prime is 266961859. The next prime is 266961881. The reversal of 266961864 is 468169662.

It is a happy number.

Its product of digits (746496) is a multiple of the sum of its prime divisors (162).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3216367 + ... + 3216449.

It is an arithmetic number, because the mean of its divisors is an integer number (5810175).

Almost surely, 2^266961864 is an apocalyptic number.

266961864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266961864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371851200).

266961864 is an abundant number, since it is smaller than the sum of its proper divisors (476740536).

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

266961864 is a wasteful number, since it uses less digits than its factorization.

266961864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 162 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The square root of 266961864 is about 16338.9676540472. The cubic root of 266961864 is about 643.8970103943.

The spelling of 266961864 in words is "two hundred sixty-six million, nine hundred sixty-one thousand, eight hundred sixty-four".