7798155840 has 168 divisors, whose sum is σ = 26939842488. Its totient is φ = 2070405120.

The previous prime is 7798155821. The next prime is 7798155913. The reversal of 7798155840 is 485518977.

7798155840 is a `hidden beast` number, since 7 + 7 + 9 + 81 + 558 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 65415744 + 7732740096 = 8088^2 + 87936^2 .

It is a super-2 number, since 2×7798155840² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 665230 + ... + 676850.

Almost surely, 2^7798155840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7798155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13469921244).

7798155840 is an abundant number, since it is smaller than the sum of its proper divisors (19141686648).

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

7798155840 is a wasteful number, since it uses less digits than its factorization.

7798155840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11877 (or 11864 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The square root of 7798155840 is about 88307.1675460152. The cubic root of 7798155840 is about 1983.0361744534.

The spelling of 7798155840 in words is "seven billion, seven hundred ninety-eight million, one hundred fifty-five thousand, eight hundred forty".