261345488 has 20 divisors (see below), whose sum is σ = 536143140. Its totient is φ = 122985984.

The previous prime is 261345473. The next prime is 261345499. The reversal of 261345488 is 884543162.

261345488 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 180848704 + 80496784 = 13448^2 + 8972^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480143 + ... + 480686.

It is an arithmetic number, because the mean of its divisors is an integer number (26807157).

Almost surely, 2^261345488 is an apocalyptic number.

It is an amenable number.

261345488 is an abundant number, since it is smaller than the sum of its proper divisors (274797652).

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

261345488 is a wasteful number, since it uses less digits than its factorization.

261345488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960854 (or 960848 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 261345488 is about 16166.1834704422. The cubic root of 261345488 is about 639.3495083395.

The spelling of 261345488 in words is "two hundred sixty-one million, three hundred forty-five thousand, four hundred eighty-eight".