261728423 has 8 divisors (see below), whose sum is σ = 285639696. Its totient is φ = 237836800.

The previous prime is 261728419. The next prime is 261728429. The reversal of 261728423 is 324827162.

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

It is a cyclic number.

It is not a de Polignac number, because 261728423 - 2² = 261728419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261728429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45383 + ... + 50823.

It is an arithmetic number, because the mean of its divisors is an integer number (35704962).

Almost surely, 2^261728423 is an apocalyptic number.

261728423 is a deficient number, since it is larger than the sum of its proper divisors (23911273).

261728423 is a wasteful number, since it uses less digits than its factorization.

261728423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9825.

The product of its digits is 32256, while the sum is 35.

The square root of 261728423 is about 16178.0228396427. The cubic root of 261728423 is about 639.6616236992.

The spelling of 261728423 in words is "two hundred sixty-one million, seven hundred twenty-eight thousand, four hundred twenty-three".