778214401 has 2 divisors, whose sum is σ = 778214402. Its totient is φ = 778214400.

The previous prime is 778214363. The next prime is 778214417. The reversal of 778214401 is 104412877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624950001 + 153264400 = 24999^2 + 12380^2 .

It is a cyclic number.

It is not a de Polignac number, because 778214401 - 2¹⁵ = 778181633 is a prime.

It is not a weakly prime, because it can be changed into another prime (778214441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389107200 + 389107201.

It is an arithmetic number, because the mean of its divisors is an integer number (389107201).

Almost surely, 2^778214401 is an apocalyptic number.

It is an amenable number.

778214401 is a deficient number, since it is larger than the sum of its proper divisors (1).

778214401 is an equidigital number, since it uses as much as digits as its factorization.

778214401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 778214401 is about 27896.4944213426. The cubic root of 778214401 is about 919.8134471302.

The spelling of 778214401 in words is "seven hundred seventy-eight million, two hundred fourteen thousand, four hundred one".