778770401 has 4 divisors (see below), whose sum is σ = 795340032. Its totient is φ = 762200772.

The previous prime is 778770389. The next prime is 778770407. The reversal of 778770401 is 104077877.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104077877 = 19 ⋅5477783.

It is a cyclic number.

It is not a de Polignac number, because 778770401 - 2¹⁴ = 778754017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (778770407) 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 3 ways as a sum of consecutive naturals, for example, 8284745 + ... + 8284838.

It is an arithmetic number, because the mean of its divisors is an integer number (198835008).

Almost surely, 2^778770401 is an apocalyptic number.

It is an amenable number.

778770401 is a deficient number, since it is larger than the sum of its proper divisors (16569631).

778770401 is a wasteful number, since it uses less digits than its factorization.

778770401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16569630.

The product of its (nonzero) digits is 76832, while the sum is 41.

The square root of 778770401 is about 27906.4580518560. The cubic root of 778770401 is about 920.0324504149.

The spelling of 778770401 in words is "seven hundred seventy-eight million, seven hundred seventy thousand, four hundred one".