778856464 has 15 divisors (see below), whose sum is σ = 1509250717. Its totient is φ = 389372416.

The previous prime is 778856461. The next prime is 778856467. The reversal of 778856464 is 464658877.

The square root of 778856464 is 27908.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (778856461) and next prime (778856467).

It can be written as a sum of positive squares in only one way, i.e., 154256400 + 624600064 = 12420^2 + 24992^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (778856461) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 108144 + ... + 115120.

Almost surely, 2^778856464 is an apocalyptic number.

778856464 is the 27908-th square number.

It is an amenable number.

778856464 is a deficient number, since it is larger than the sum of its proper divisors (730394253).

778856464 is an frugal number, since it uses more digits than its factorization.

778856464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13962 (or 6979 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 55.

The cubic root of 778856464 is about 920.0663405217.

The spelling of 778856464 in words is "seven hundred seventy-eight million, eight hundred fifty-six thousand, four hundred sixty-four".