261308016 has 30 divisors (see below), whose sum is σ = 731299920. Its totient is φ = 87102624.

The previous prime is 261308011. The next prime is 261308029. The reversal of 261308016 is 610803162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261308011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 907176 + ... + 907463.

It is an arithmetic number, because the mean of its divisors is an integer number (24376664).

Almost surely, 2^261308016 is an apocalyptic number.

It is an amenable number.

261308016 is an abundant number, since it is smaller than the sum of its proper divisors (469991904).

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

261308016 is a wasteful number, since it uses less digits than its factorization.

261308016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814653 (or 1814644 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 261308016 is about 16165.0244664213. The cubic root of 261308016 is about 639.3189500033.

The spelling of 261308016 in words is "two hundred sixty-one million, three hundred eight thousand, sixteen".