7778461540 has 24 divisors (see below), whose sum is σ = 17044977600. Its totient is φ = 2976106848.

The previous prime is 7778461531. The next prime is 7778461553. The reversal of 7778461540 is 451648777.

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 7 ways as a sum of consecutive naturals, for example, 8454390 + ... + 8455309.

It is an arithmetic number, because the mean of its divisors is an integer number (710207400).

Almost surely, 2^7778461540 is an apocalyptic number.

It is an amenable number.

7778461540 is an abundant number, since it is smaller than the sum of its proper divisors (9266516060).

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

7778461540 is a wasteful number, since it uses less digits than its factorization.

7778461540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16909731 (or 16909729 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 49.

The square root of 7778461540 is about 88195.5868510437. The cubic root of 7778461540 is about 1981.3653763047.

The spelling of 7778461540 in words is "seven billion, seven hundred seventy-eight million, four hundred sixty-one thousand, five hundred forty".