778825491 has 8 divisors (see below), whose sum is σ = 1055457744. Its totient is φ = 510705120.

The previous prime is 778825477. The next prime is 778825499. The reversal of 778825491 is 194528877.

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

It is not a de Polignac number, because 778825491 - 2⁶ = 778825427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (778825499) by changing a digit.

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, 2127756 + ... + 2128121.

It is an arithmetic number, because the mean of its divisors is an integer number (131932218).

Almost surely, 2^778825491 is an apocalyptic number.

778825491 is a deficient number, since it is larger than the sum of its proper divisors (276632253).

778825491 is a wasteful number, since it uses less digits than its factorization.

778825491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255941.

The product of its digits is 1128960, while the sum is 51.

The square root of 778825491 is about 27907.4450819132. The cubic root of 778825491 is about 920.0541441827.

The spelling of 778825491 in words is "seven hundred seventy-eight million, eight hundred twenty-five thousand, four hundred ninety-one".