261061836 has 48 divisors (see below), whose sum is σ = 699815424. Its totient is φ = 74198016.

The previous prime is 261061813. The next prime is 261061841. The reversal of 261061836 is 638160162.

It is a junction number, because it is equal to n+sod(n) for n = 261061797 and 261061806.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8161 + ... + 24263.

It is an arithmetic number, because the mean of its divisors is an integer number (14579488).

Almost surely, 2^261061836 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 261061836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349907712).

261061836 is an abundant number, since it is smaller than the sum of its proper divisors (438753588).

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

261061836 is a wasteful number, since it uses less digits than its factorization.

261061836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16310 (or 16308 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 261061836 is about 16157.4080842194. The cubic root of 261061836 is about 639.1181180596.

It can be divided in two parts, 2610 and 61836, that added together give a palindrome (64446).

The spelling of 261061836 in words is "two hundred sixty-one million, sixty-one thousand, eight hundred thirty-six".