7978584340 has 24 divisors (see below), whose sum is σ = 16761398472. Its totient is φ = 3190220160.

The previous prime is 7978584307. The next prime is 7978584343. The reversal of 7978584340 is 434858797.

It can be written as a sum of positive squares in 4 ways, for example, as 1082278404 + 6896305936 = 32898^2 + 83044^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978584343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20971 + ... + 128050.

It is an arithmetic number, because the mean of its divisors is an integer number (698391603).

Almost surely, 2^7978584340 is an apocalyptic number.

It is an amenable number.

7978584340 is an abundant number, since it is smaller than the sum of its proper divisors (8782814132).

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

7978584340 is a wasteful number, since it uses less digits than its factorization.

7978584340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151707 (or 151705 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 55.

The square root of 7978584340 is about 89322.9216942661. The cubic root of 7978584340 is about 1998.2137668271.

The spelling of 7978584340 in words is "seven billion, nine hundred seventy-eight million, five hundred eighty-four thousand, three hundred forty".