778942401 has 16 divisors (see below), whose sum is σ = 1050551040. Its totient is φ = 513331200.

The previous prime is 778942399. The next prime is 778942429. The reversal of 778942401 is 104249877.

It is a happy number.

It is not a de Polignac number, because 778942401 - 2¹ = 778942399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (778902401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231336 + ... + 234678.

It is an arithmetic number, because the mean of its divisors is an integer number (65659440).

Almost surely, 2^778942401 is an apocalyptic number.

It is an amenable number.

778942401 is a deficient number, since it is larger than the sum of its proper divisors (271608639).

778942401 is a wasteful number, since it uses less digits than its factorization.

778942401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 778942401 is about 27909.5396056617. The cubic root of 778942401 is about 920.1001785209.

The spelling of 778942401 in words is "seven hundred seventy-eight million, nine hundred forty-two thousand, four hundred one".