261824642 has 8 divisors (see below), whose sum is σ = 392805696. Its totient is φ = 130889412.

The previous prime is 261824621. The next prime is 261824681. The reversal of 261824642 is 246428162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15803 + ... + 27809.

It is an arithmetic number, because the mean of its divisors is an integer number (49100712).

Almost surely, 2^261824642 is an apocalyptic number.

261824642 is a deficient number, since it is larger than the sum of its proper divisors (130981054).

261824642 is a wasteful number, since it uses less digits than its factorization.

261824642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22912.

The product of its digits is 36864, while the sum is 35.

The square root of 261824642 is about 16180.9963228474. The cubic root of 261824642 is about 639.7400001837.

The spelling of 261824642 in words is "two hundred sixty-one million, eight hundred twenty-four thousand, six hundred forty-two".