778397434 has 8 divisors (see below), whose sum is σ = 1229048640. Its totient is φ = 368714556.

The previous prime is 778397429. The next prime is 778397461. The reversal of 778397434 is 434793877.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10242034 + ... + 10242109.

It is an arithmetic number, because the mean of its divisors is an integer number (153631080).

Almost surely, 2^778397434 is an apocalyptic number.

778397434 is a deficient number, since it is larger than the sum of its proper divisors (450651206).

778397434 is a wasteful number, since it uses less digits than its factorization.

778397434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20484164.

The product of its digits is 3556224, while the sum is 52.

The square root of 778397434 is about 27899.7748019585. The cubic root of 778397434 is about 919.8855536591.

The spelling of 778397434 in words is "seven hundred seventy-eight million, three hundred ninety-seven thousand, four hundred thirty-four".