261701632 has 30 divisors (see below), whose sum is σ = 523420058. Its totient is φ = 130842624.

The previous prime is 261701617. The next prime is 261701633. The reversal of 261701632 is 236107162.

It can be written as a sum of positive squares in only one way, i.e., 243859456 + 17842176 = 15616^2 + 4224^2 .

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 261701632.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261701633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8398 + ... + 24370.

Almost surely, 2^261701632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261701632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261710029).

261701632 is an abundant number, since it is smaller than the sum of its proper divisors (261718426).

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

261701632 is an frugal number, since it uses more digits than its factorization.

261701632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16001 (or 15975 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 261701632 is about 16177.1948124513. The cubic root of 261701632 is about 639.6397973099.

Adding to 261701632 its reverse (236107162), we get a palindrome (497808794).

The spelling of 261701632 in words is "two hundred sixty-one million, seven hundred one thousand, six hundred thirty-two".