266407920 has 160 divisors (see below), whose sum is σ = 949492800. Its totient is φ = 68576256.

The previous prime is 266407913. The next prime is 266407937. The reversal of 266407920 is 29704662.

It is a happy number.

266407920 is a `hidden beast` number, since 2 + 6 + 640 + 7 + 9 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 60514 + ... + 64766.

It is an arithmetic number, because the mean of its divisors is an integer number (5934330).

Almost surely, 2^266407920 is an apocalyptic number.

266407920 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 266407920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474746400).

266407920 is an abundant number, since it is smaller than the sum of its proper divisors (683084880).

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

266407920 is a wasteful number, since it uses less digits than its factorization.

266407920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304 (or 4292 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 266407920 is about 16322.0072295046. The cubic root of 266407920 is about 643.4513414015.

The spelling of 266407920 in words is "two hundred sixty-six million, four hundred seven thousand, nine hundred twenty".