261495104 has 56 divisors (see below), whose sum is σ = 567281568. Its totient is φ = 118863360.

The previous prime is 261495097. The next prime is 261495107. The reversal of 261495104 is 401594162.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261495107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53399 + ... + 58089.

It is an arithmetic number, because the mean of its divisors is an integer number (10130028).

Almost surely, 2^261495104 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 261495104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283640784).

261495104 is an abundant number, since it is smaller than the sum of its proper divisors (305786464).

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

261495104 is a wasteful number, since it uses less digits than its factorization.

261495104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4783 (or 4773 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 261495104 is about 16170.8102456247. The cubic root of 261495104 is about 639.4714907628.

The spelling of 261495104 in words is "two hundred sixty-one million, four hundred ninety-five thousand, one hundred four".