7678728073640 has 128 divisors (see below), whose sum is σ = 19082843619840. Its totient is φ = 2762888196096.

The previous prime is 7678728073537. The next prime is 7678728073703. The reversal of 7678728073640 is 463708278767.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9285329 + ... + 10078431.

It is an arithmetic number, because the mean of its divisors is an integer number (149084715780).

Almost surely, 2^{7678728073640} 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 7678728073640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9541421809920).

7678728073640 is an abundant number, since it is smaller than the sum of its proper divisors (11404115546200).

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

7678728073640 is a wasteful number, since it uses less digits than its factorization.

7678728073640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793603 (or 793599 counting only the distinct ones).

The product of its (nonzero) digits is 132765696, while the sum is 65.

The spelling of 7678728073640 in words is "seven trillion, six hundred seventy-eight billion, seven hundred twenty-eight million, seventy-three thousand, six hundred forty".