261090486 has 64 divisors (see below), whose sum is σ = 594604800. Its totient is φ = 84898368.

The previous prime is 261090481. The next prime is 261090493. The reversal of 261090486 is 684090162.

It is a self number, because there is not a number n which added to its sum of digits gives 261090486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261090481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421485 + ... + 422103.

It is an arithmetic number, because the mean of its divisors is an integer number (9290700).

Almost surely, 2^261090486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261090486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297302400).

261090486 is an abundant number, since it is smaller than the sum of its proper divisors (333514314).

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

261090486 is a wasteful number, since it uses less digits than its factorization.

261090486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 261090486 is about 16158.2946501170. The cubic root of 261090486 is about 639.1414970216.

It can be divided in two parts, 2610 and 90486, that added together give a triangular number (93096 = T₄₃₁).

The spelling of 261090486 in words is "two hundred sixty-one million, ninety thousand, four hundred eighty-six".