778161252 has 24 divisors (see below), whose sum is σ = 1980774432. Its totient is φ = 235806400.

The previous prime is 778161199. The next prime is 778161259. The reversal of 778161252 is 252161877.

It is a super-2 number, since 2×778161252² = 1211069868228415008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 778161252.

It is not an unprimeable number, because it can be changed into a prime (778161259) 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, 2947449 + ... + 2947712.

It is an arithmetic number, because the mean of its divisors is an integer number (82532268).

Almost surely, 2^778161252 is an apocalyptic number.

It is an amenable number.

778161252 is an abundant number, since it is smaller than the sum of its proper divisors (1202613180).

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

778161252 is a wasteful number, since it uses less digits than its factorization.

778161252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895179 (or 5895177 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 778161252 is about 27895.5417943441. The cubic root of 778161252 is about 919.7925067665.

The spelling of 778161252 in words is "seven hundred seventy-eight million, one hundred sixty-one thousand, two hundred fifty-two".