261006769 has 8 divisors (see below), whose sum is σ = 268267688. Its totient is φ = 253756800.

The previous prime is 261006719. The next prime is 261006773. The reversal of 261006769 is 967600162.

It can be written as a sum of positive squares in 4 ways, for example, as 8196769 + 252810000 = 2863^2 + 15900^2 .

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 261006769 - 2⁹ = 261006257 is a prime.

It is a super-2 number, since 2×261006769² = 136249066927638722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261006709) 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, 77419 + ... + 80719.

It is an arithmetic number, because the mean of its divisors is an integer number (33533461).

Almost surely, 2^261006769 is an apocalyptic number.

261006769 is the 9328-th hex number.

It is an amenable number.

261006769 is a deficient number, since it is larger than the sum of its proper divisors (7260919).

261006769 is a wasteful number, since it uses less digits than its factorization.

261006769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5475.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 261006769 is about 16155.7039153359. The cubic root of 261006769 is about 639.0731775035.

The spelling of 261006769 in words is "two hundred sixty-one million, six thousand, seven hundred sixty-nine".