261207216 has 30 divisors (see below), whose sum is σ = 731017820. Its totient is φ = 87069024.

The previous prime is 261207211. The next prime is 261207217. The reversal of 261207216 is 612702162.

261207216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261207216.

It is not an unprimeable number, because it can be changed into a prime (261207211) 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, 906826 + ... + 907113.

Almost surely, 2^261207216 is an apocalyptic number.

It is an amenable number.

261207216 is an abundant number, since it is smaller than the sum of its proper divisors (469810604).

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

261207216 is a wasteful number, since it uses less digits than its factorization.

261207216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813953 (or 1813944 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 261207216 is about 16161.9063232033. The cubic root of 261207216 is about 639.2367333160.

Adding to 261207216 its reverse (612702162), we get a palindrome (873909378).

The spelling of 261207216 in words is "two hundred sixty-one million, two hundred seven thousand, two hundred sixteen".