261485072 has 10 divisors (see below), whose sum is σ = 506627358. Its totient is φ = 130742528.

The previous prime is 261485071. The next prime is 261485123. The reversal of 261485072 is 270584162.

261485072 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 only one way, i.e., 254849296 + 6635776 = 15964^2 + 2576^2 .

It is not an unprimeable number, because it can be changed into a prime (261485071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8171393 + ... + 8171424.

Almost surely, 2^261485072 is an apocalyptic number.

It is an amenable number.

261485072 is a deficient number, since it is larger than the sum of its proper divisors (245142286).

261485072 is a wasteful number, since it uses less digits than its factorization.

261485072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16342825 (or 16342819 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 261485072 is about 16170.5000541109. The cubic root of 261485072 is about 639.4633130953.

The spelling of 261485072 in words is "two hundred sixty-one million, four hundred eighty-five thousand, seventy-two".