261728622 has 12 divisors (see below), whose sum is σ = 567078720. Its totient is φ = 87242868.

The previous prime is 261728603. The next prime is 261728627. The reversal of 261728622 is 226827162.

261728622 is a `hidden beast` number, since 2 + 6 + 1 + 7 + 28 + 622 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261728627) 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 5 ways as a sum of consecutive naturals, for example, 7270222 + ... + 7270257.

It is an arithmetic number, because the mean of its divisors is an integer number (47256560).

Almost surely, 2^261728622 is an apocalyptic number.

261728622 is an abundant number, since it is smaller than the sum of its proper divisors (305350098).

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

261728622 is a wasteful number, since it uses less digits than its factorization.

261728622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14540487 (or 14540484 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 261728622 is about 16178.0289899604. The cubic root of 261728622 is about 639.6617858172.

The spelling of 261728622 in words is "two hundred sixty-one million, seven hundred twenty-eight thousand, six hundred twenty-two".