261439488 has 150 divisors (see below), whose sum is σ = 785031786. Its totient is φ = 86704128.

The previous prime is 261439483. The next prime is 261439501. The reversal of 261439488 is 884934162.

It is a happy number.

261439488 is a `hidden beast` number, since 26 + 143 + 9 + 488 = 666.

It can be written as a sum of positive squares in only one way, i.e., 260112384 + 1327104 = 16128^2 + 1152^2 .

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a nialpdrome in base 4 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261439483) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1327006 + ... + 1327202.

Almost surely, 2^261439488 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 261439488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392515893).

261439488 is an abundant number, since it is smaller than the sum of its proper divisors (523592298).

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

261439488 is an frugal number, since it uses more digits than its factorization.

261439488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 202 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 261439488 is about 16169.0905124562. The cubic root of 261439488 is about 639.4261522873.

The spelling of 261439488 in words is "two hundred sixty-one million, four hundred thirty-nine thousand, four hundred eighty-eight".