266979440 has 240 divisors, whose sum is σ = 807448320. Its totient is φ = 81768960.

The previous prime is 266979439. The next prime is 266979451. The reversal of 266979440 is 44979662.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8612225 + ... + 8612255.

It is an arithmetic number, because the mean of its divisors is an integer number (3364368).

Almost surely, 2^266979440 is an apocalyptic number.

266979440 is a gapful number since it is divisible by the number (20) 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 266979440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403724160).

266979440 is an abundant number, since it is smaller than the sum of its proper divisors (540468880).

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

266979440 is a wasteful number, since it uses less digits than its factorization.

266979440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 266979440 is about 16339.5055004734. The cubic root of 266979440 is about 643.9111408589.

The spelling of 266979440 in words is "two hundred sixty-six million, nine hundred seventy-nine thousand, four hundred forty".