7838781380 has 12 divisors (see below), whose sum is σ = 16461440940. Its totient is φ = 3135512544.

The previous prime is 7838781371. The next prime is 7838781421. The reversal of 7838781380 is 831878387.

It can be written as a sum of positive squares in 2 ways, for example, as 3046819204 + 4791962176 = 55198^2 + 69224^2 .

It is a super-2 number, since 2×7838781380² (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 3 ways as a sum of consecutive naturals, for example, 195969515 + ... + 195969554.

It is an arithmetic number, because the mean of its divisors is an integer number (1371786745).

Almost surely, 2^7838781380 is an apocalyptic number.

It is an amenable number.

7838781380 is an abundant number, since it is smaller than the sum of its proper divisors (8622659560).

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

7838781380 is a wasteful number, since it uses less digits than its factorization.

7838781380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391939078 (or 391939076 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 53.

The square root of 7838781380 is about 88536.8927622830. The cubic root of 7838781380 is about 1986.4738427605.

The spelling of 7838781380 in words is "seven billion, eight hundred thirty-eight million, seven hundred eighty-one thousand, three hundred eighty".