261020376 has 96 divisors (see below), whose sum is σ = 742959360. Its totient is φ = 82627776.

The previous prime is 261020371. The next prime is 261020377. The reversal of 261020376 is 673020162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261020371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269445 + ... + 270411.

It is an arithmetic number, because the mean of its divisors is an integer number (7739160).

Almost surely, 2^261020376 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 261020376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371479680).

261020376 is an abundant number, since it is smaller than the sum of its proper divisors (481938984).

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

261020376 is a wasteful number, since it uses less digits than its factorization.

261020376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 261020376 is about 16156.1250304645. The cubic root of 261020376 is about 639.0842828574.

The spelling of 261020376 in words is "two hundred sixty-one million, twenty thousand, three hundred seventy-six".