266772720 has 40 divisors (see below), whose sum is σ = 826996176. Its totient is φ = 71139328.

The previous prime is 266772677. The next prime is 266772739. The reversal of 266772720 is 27277662.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 555537 + ... + 556016.

Almost surely, 2^266772720 is an apocalyptic number.

266772720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266772720 is an abundant number, since it is smaller than the sum of its proper divisors (560223456).

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

266772720 is a wasteful number, since it uses less digits than its factorization.

266772720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111569 (or 1111563 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 266772720 is about 16333.1785026675. The cubic root of 266772720 is about 643.7449062342.

The spelling of 266772720 in words is "two hundred sixty-six million, seven hundred seventy-two thousand, seven hundred twenty".