778851940 has 48 divisors (see below), whose sum is σ = 1734188400. Its totient is φ = 292810752.

The previous prime is 778851901. The next prime is 778851943. The reversal of 778851940 is 49158877.

778851940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 25020004 + 753831936 = 5002^2 + 27456^2 .

It is a super-2 number, since 2×778851940² = 1213220688883527200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (778851943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382846 + ... + 384874.

It is an arithmetic number, because the mean of its divisors is an integer number (36128925).

Almost surely, 2^778851940 is an apocalyptic number.

It is an amenable number.

778851940 is an abundant number, since it is smaller than the sum of its proper divisors (955336460).

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

778851940 is a wasteful number, since it uses less digits than its factorization.

778851940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3184 (or 3182 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

The square root of 778851940 is about 27907.9189478542. The cubic root of 778851940 is about 920.0645591117.

The spelling of 778851940 in words is "seven hundred seventy-eight million, eight hundred fifty-one thousand, nine hundred forty".