778538860 has 24 divisors (see below), whose sum is σ = 1783562256. Its totient is φ = 283104960.

The previous prime is 778538837. The next prime is 778538863. The reversal of 778538860 is 68835877.

It is a super-2 number, since 2×778538860² = 1212245513060199200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 778538798 and 778538807.

It is not an unprimeable number, because it can be changed into a prime (778538863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1769187 + ... + 1769626.

It is an arithmetic number, because the mean of its divisors is an integer number (74315094).

Almost surely, 2^778538860 is an apocalyptic number.

It is an amenable number.

778538860 is an abundant number, since it is smaller than the sum of its proper divisors (1005023396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778538860 is a wasteful number, since it uses less digits than its factorization.

778538860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538833 (or 3538831 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 52.

The square root of 778538860 is about 27902.3092234317. The cubic root of 778538860 is about 919.9412612152.

The spelling of 778538860 in words is "seven hundred seventy-eight million, five hundred thirty-eight thousand, eight hundred sixty".