261362620 has 48 divisors (see below), whose sum is σ = 558129600. Its totient is φ = 102795264.

The previous prime is 261362609. The next prime is 261362623. The reversal of 261362620 is 26263162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261362623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385722 + ... + 386398.

It is an arithmetic number, because the mean of its divisors is an integer number (11627700).

Almost surely, 2^261362620 is an apocalyptic number.

261362620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261362620 is an abundant number, since it is smaller than the sum of its proper divisors (296766980).

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

261362620 is a wasteful number, since it uses less digits than its factorization.

261362620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 261362620 is about 16166.7133332660. The cubic root of 261362620 is about 639.3634784760.

The spelling of 261362620 in words is "two hundred sixty-one million, three hundred sixty-two thousand, six hundred twenty".