261064128 has 56 divisors (see below), whose sum is σ = 743872528. Its totient is φ = 80326656.

The previous prime is 261064117. The next prime is 261064147. The reversal of 261064128 is 821460162.

261064128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261064095 and 261064104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49801 + ... + 54792.

It is an arithmetic number, because the mean of its divisors is an integer number (13283438).

Almost surely, 2^261064128 is an apocalyptic number.

It is an amenable number.

261064128 is an abundant number, since it is smaller than the sum of its proper divisors (482808400).

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

261064128 is a wasteful number, since it uses less digits than its factorization.

261064128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104621 (or 104611 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 261064128 is about 16157.4790112814. The cubic root of 261064128 is about 639.1199884395.

The spelling of 261064128 in words is "two hundred sixty-one million, sixty-four thousand, one hundred twenty-eight".