266635240 has 16 divisors (see below), whose sum is σ = 599929380. Its totient is φ = 106654080.

The previous prime is 266635231. The next prime is 266635261. The reversal of 266635240 is 42536662.

It can be written as a sum of positive squares in 2 ways, for example, as 263153284 + 3481956 = 16222^2 + 1866^2 .

It is a junction number, because it is equal to n+sod(n) for n = 266635196 and 266635205.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3332901 + ... + 3332980.

Almost surely, 2^266635240 is an apocalyptic number.

266635240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266635240 is an abundant number, since it is smaller than the sum of its proper divisors (333294140).

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

266635240 is a wasteful number, since it uses less digits than its factorization.

266635240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6665892 (or 6665888 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 266635240 is about 16328.9693489822. The cubic root of 266635240 is about 643.6343036495.

The spelling of 266635240 in words is "two hundred sixty-six million, six hundred thirty-five thousand, two hundred forty".