778356478 has 8 divisors (see below), whose sum is σ = 1218297168. Its totient is φ = 372257424.

The previous prime is 778356473. The next prime is 778356479. The reversal of 778356478 is 874653877.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778356473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8460351 + ... + 8460442.

It is an arithmetic number, because the mean of its divisors is an integer number (152287146).

Almost surely, 2^778356478 is an apocalyptic number.

778356478 is a deficient number, since it is larger than the sum of its proper divisors (439940690).

778356478 is a wasteful number, since it uses less digits than its factorization.

778356478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16920818.

The product of its digits is 7902720, while the sum is 55.

The square root of 778356478 is about 27899.0408078844. The cubic root of 778356478 is about 919.8694198728.

It can be divided in two parts, 7783 and 56478, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 778356478 in words is "seven hundred seventy-eight million, three hundred fifty-six thousand, four hundred seventy-eight".