261236460 has 48 divisors (see below), whose sum is σ = 737243136. Its totient is φ = 69112512.

The previous prime is 261236429. The next prime is 261236471. The reversal of 261236460 is 64632162.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 9522 + ... + 24761.

It is an arithmetic number, because the mean of its divisors is an integer number (15359232).

Almost surely, 2^261236460 is an apocalyptic number.

261236460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261236460 is an abundant number, since it is smaller than the sum of its proper divisors (476006676).

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

261236460 is a wasteful number, since it uses less digits than its factorization.

261236460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34422 (or 34420 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 261236460 is about 16162.8110178892. The cubic root of 261236460 is about 639.2605881208.

The spelling of 261236460 in words is "two hundred sixty-one million, two hundred thirty-six thousand, four hundred sixty".