261463660 has 12 divisors (see below), whose sum is σ = 549073728. Its totient is φ = 104585456.

The previous prime is 261463639. The next prime is 261463661. The reversal of 261463660 is 66364162.

It is not an unprimeable number, because it can be changed into a prime (261463661) 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 3 ways as a sum of consecutive naturals, for example, 6536572 + ... + 6536611.

It is an arithmetic number, because the mean of its divisors is an integer number (45756144).

Almost surely, 2^261463660 is an apocalyptic number.

261463660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261463660 is an abundant number, since it is smaller than the sum of its proper divisors (287610068).

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

261463660 is a wasteful number, since it uses less digits than its factorization.

261463660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13073192 (or 13073190 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 261463660 is about 16169.8379707405. The cubic root of 261463660 is about 639.4458582274.

The spelling of 261463660 in words is "two hundred sixty-one million, four hundred sixty-three thousand, six hundred sixty".