261203680 has 24 divisors (see below), whose sum is σ = 617094072. Its totient is φ = 104481408.

The previous prime is 261203641. The next prime is 261203687. The reversal of 261203680 is 86302162.

261203680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261203687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816102 + ... + 816421.

It is an arithmetic number, because the mean of its divisors is an integer number (25712253).

Almost surely, 2^261203680 is an apocalyptic number.

261203680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261203680 is an abundant number, since it is smaller than the sum of its proper divisors (355890392).

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

261203680 is a wasteful number, since it uses less digits than its factorization.

261203680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632538 (or 1632530 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 261203680 is about 16161.7969297971. The cubic root of 261203680 is about 639.2338488228.

The spelling of 261203680 in words is "two hundred sixty-one million, two hundred three thousand, six hundred eighty".