778494141 has 24 divisors (see below), whose sum is σ = 1191695544. Its totient is φ = 488033280.

The previous prime is 778494121. The next prime is 778494149. The reversal of 778494141 is 141494877.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11758041 + 766736100 = 3429^2 + 27690^2 .

It is not a de Polignac number, because 778494141 - 2¹³ = 778485949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778494149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325771 + ... + 328151.

It is an arithmetic number, because the mean of its divisors is an integer number (49653981).

Almost surely, 2^778494141 is an apocalyptic number.

It is an amenable number.

778494141 is a deficient number, since it is larger than the sum of its proper divisors (413201403).

778494141 is a wasteful number, since it uses less digits than its factorization.

778494141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4541 (or 4538 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 778494141 is about 27901.5078624794. The cubic root of 778494141 is about 919.9236471764.

The spelling of 778494141 in words is "seven hundred seventy-eight million, four hundred ninety-four thousand, one hundred forty-one".