266409820 has 12 divisors (see below), whose sum is σ = 559460664. Its totient is φ = 106563920.

The previous prime is 266409797. The next prime is 266409823. The reversal of 266409820 is 28904662.

It is a self number, because there is not a number n which added to its sum of digits gives 266409820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266409823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660226 + ... + 6660265.

It is an arithmetic number, because the mean of its divisors is an integer number (46621722).

Almost surely, 2^266409820 is an apocalyptic number.

266409820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266409820 is an abundant number, since it is smaller than the sum of its proper divisors (293050844).

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

266409820 is a wasteful number, since it uses less digits than its factorization.

266409820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13320500 (or 13320498 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 266409820 is about 16322.0654330265. The cubic root of 266409820 is about 643.4528710790.

The spelling of 266409820 in words is "two hundred sixty-six million, four hundred nine thousand, eight hundred twenty".