266193640 has 32 divisors (see below), whose sum is σ = 600091560. Its totient is φ = 106272000.

The previous prime is 266193619. The next prime is 266193647. The reversal of 266193640 is 46391662.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 183710916 + 82482724 = 13554^2 + 9082^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 266193640.

It is not an unprimeable number, because it can be changed into a prime (266193647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15490 + ... + 27790.

Almost surely, 2^266193640 is an apocalyptic number.

266193640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266193640 is an abundant number, since it is smaller than the sum of its proper divisors (333897920).

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

266193640 is a wasteful number, since it uses less digits than its factorization.

266193640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12853 (or 12849 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 266193640 is about 16315.4417653951. The cubic root of 266193640 is about 643.2787792936.

The spelling of 266193640 in words is "two hundred sixty-six million, one hundred ninety-three thousand, six hundred forty".