261272336 has 40 divisors (see below), whose sum is σ = 558469464. Its totient is φ = 117642240.

The previous prime is 261272327. The next prime is 261272357. The reversal of 261272336 is 633272162.

It can be written as a sum of positive squares in 4 ways, for example, as 10240000 + 251032336 = 3200^2 + 15844^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6791 + ... + 23846.

Almost surely, 2^261272336 is an apocalyptic number.

261272336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

261272336 is an abundant number, since it is smaller than the sum of its proper divisors (297197128).

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

261272336 is a wasteful number, since it uses less digits than its factorization.

261272336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30699 (or 30693 counting only the distinct ones).

The product of its digits is 18144, while the sum is 32.

The square root of 261272336 is about 16163.9208114863. The cubic root of 261272336 is about 639.2898503239.

The spelling of 261272336 in words is "two hundred sixty-one million, two hundred seventy-two thousand, three hundred thirty-six".