778261 has 8 divisors (see below), whose sum is σ = 856800. Its totient is φ = 701040.

The previous prime is 778247. The next prime is 778301. The reversal of 778261 is 162877.

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 778261 - 2¹³ = 770069 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 (778201) 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, 1275 + ... + 1783.

It is an arithmetic number, because the mean of its divisors is an integer number (107100).

2⁷⁷⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

778261 is a deficient number, since it is larger than the sum of its proper divisors (78539).

778261 is a wasteful number, since it uses less digits than its factorization.

778261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its digits is 4704, while the sum is 31.

The square root of 778261 is about 882.1910223982. The cubic root of 778261 is about 91.9831806052.

It can be divided in two parts, 77 and 8261, that added together give a palindrome (8338).

The spelling of 778261 in words is "seven hundred seventy-eight thousand, two hundred sixty-one".