261336120 has 64 divisors (see below), whose sum is σ = 818104320. Its totient is φ = 66658944.

The previous prime is 261336079. The next prime is 261336149. The reversal of 261336120 is 21633162.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44584 + ... + 50103.

It is an arithmetic number, because the mean of its divisors is an integer number (12782880).

Almost surely, 2^261336120 is an apocalyptic number.

261336120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261336120 is an abundant number, since it is smaller than the sum of its proper divisors (556768200).

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

261336120 is a wasteful number, since it uses less digits than its factorization.

261336120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94724 (or 94720 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 261336120 is about 16165.8937272271. The cubic root of 261336120 is about 639.3418690293.

Adding to 261336120 its reverse (21633162), we get a palindrome (282969282).

The spelling of 261336120 in words is "two hundred sixty-one million, three hundred thirty-six thousand, one hundred twenty".