261828445 has 8 divisors (see below), whose sum is σ = 316076544. Its totient is φ = 208207824.

The previous prime is 261828403. The next prime is 261828451. The reversal of 261828445 is 544828162.

It is a happy number.

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 261828445 - 2²¹ = 259731293 is a prime.

It is a super-2 number, since 2×261828445² = 137108269222236050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261828398 and 261828407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155949 + ... + 157618.

It is an arithmetic number, because the mean of its divisors is an integer number (39509568).

Almost surely, 2^261828445 is an apocalyptic number.

It is an amenable number.

261828445 is a deficient number, since it is larger than the sum of its proper divisors (54248099).

261828445 is a wasteful number, since it uses less digits than its factorization.

261828445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313739.

The product of its digits is 122880, while the sum is 40.

The square root of 261828445 is about 16181.1138368161. The cubic root of 261828445 is about 639.7430975742.

The spelling of 261828445 in words is "two hundred sixty-one million, eight hundred twenty-eight thousand, four hundred forty-five".