260821779 has 4 divisors (see below), whose sum is σ = 347762376. Its totient is φ = 173881184.

The previous prime is 260821751. The next prime is 260821783. The reversal of 260821779 is 977128062.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 260821779 - 2⁸ = 260821523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 260821779.

It is not an unprimeable number, because it can be changed into a prime (260821579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43470294 + ... + 43470299.

It is an arithmetic number, because the mean of its divisors is an integer number (86940594).

Almost surely, 2^260821779 is an apocalyptic number.

260821779 is a deficient number, since it is larger than the sum of its proper divisors (86940597).

260821779 is an equidigital number, since it uses as much as digits as its factorization.

260821779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86940596.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 260821779 is about 16149.9776780031. The cubic root of 260821779 is about 638.9221595959.

The spelling of 260821779 in words is "two hundred sixty million, eight hundred twenty-one thousand, seven hundred seventy-nine".