261026136 has 144 divisors (see below), whose sum is σ = 828467640. Its totient is φ = 74027520.

The previous prime is 261026093. The next prime is 261026153. The reversal of 261026136 is 631620162.

261026136 = 2284² + 2285² + ... + 2332².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 850095 + ... + 850401.

Almost surely, 2^261026136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261026136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414233820).

261026136 is an abundant number, since it is smaller than the sum of its proper divisors (567441504).

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

261026136 is a wasteful number, since it uses less digits than its factorization.

261026136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 261026136 is about 16156.3032900475. The cubic root of 261026136 is about 639.0889837655.

Adding to 261026136 its reverse (631620162), we get a palindrome (892646298).

It can be divided in two parts, 261026 and 136, that added together give a palindrome (261162).

The spelling of 261026136 in words is "two hundred sixty-one million, twenty-six thousand, one hundred thirty-six".