7778440890 has 48 divisors (see below), whose sum is σ = 22062489696. Its totient is φ = 1885682400.

The previous prime is 7778440823. The next prime is 7778440903. The reversal of 7778440890 is 980448777.

7778440890 is a `hidden beast` number, since 7 + 77 + 84 + 408 + 90 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3927516 + ... + 3929495.

It is an arithmetic number, because the mean of its divisors is an integer number (459635202).

Almost surely, 2^7778440890 is an apocalyptic number.

7778440890 is an abundant number, since it is smaller than the sum of its proper divisors (14284048806).

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

7778440890 is a wasteful number, since it uses less digits than its factorization.

7778440890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857035 (or 7857032 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The square root of 7778440890 is about 88195.4697816163. The cubic root of 7778440890 is about 1981.3636229489.

The spelling of 7778440890 in words is "seven billion, seven hundred seventy-eight million, four hundred forty thousand, eight hundred ninety".