261338460 has 48 divisors (see below), whose sum is σ = 737112096. Its totient is φ = 69179392.

The previous prime is 261338453. The next prime is 261338461. The reversal of 261338460 is 64833162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261338461) 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 15 ways as a sum of consecutive naturals, for example, 7677 + ... + 24116.

It is an arithmetic number, because the mean of its divisors is an integer number (15356502).

Almost surely, 2^261338460 is an apocalyptic number.

261338460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261338460 is an abundant number, since it is smaller than the sum of its proper divisors (475773636).

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

261338460 is a wasteful number, since it uses less digits than its factorization.

261338460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31942 (or 31940 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 261338460 is about 16165.9661016594. The cubic root of 261338460 is about 639.3437772430.

The spelling of 261338460 in words is "two hundred sixty-one million, three hundred thirty-eight thousand, four hundred sixty".