266675640 has 512 divisors, whose sum is σ = 1105920000. Its totient is φ = 50803200.

The previous prime is 266675599. The next prime is 266675641. The reversal of 266675640 is 46576662.

266675640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×266675640² = 142231793938819200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 266675592 and 266675601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266675641) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8602425 + ... + 8602455.

It is an arithmetic number, because the mean of its divisors is an integer number (2160000).

Almost surely, 2^266675640 is an apocalyptic number.

266675640 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 266675640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552960000).

266675640 is an abundant number, since it is smaller than the sum of its proper divisors (839244360).

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

266675640 is a wasteful number, since it uses less digits than its factorization.

266675640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 266675640 is about 16330.2063673427. The cubic root of 266675640 is about 643.6668093712. Note that the first 3 decimals are identical.

The spelling of 266675640 in words is "two hundred sixty-six million, six hundred seventy-five thousand, six hundred forty".