7953991378 has 16 divisors (see below), whose sum is σ = 12109198680. Its totient is φ = 3917725056.

The previous prime is 7953991333. The next prime is 7953991379. The reversal of 7953991378 is 8731993597.

It can be written as a sum of positive squares in 4 ways, for example, as 6633613809 + 1320377569 = 81447^2 + 36337^2 .

It is not an unprimeable number, because it can be changed into a prime (7953991379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88176 + ... + 153892.

Almost surely, 2^7953991378 is an apocalyptic number.

7953991378 is a deficient number, since it is larger than the sum of its proper divisors (4155207302).

7953991378 is a wasteful number, since it uses less digits than its factorization.

7953991378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66621.

The product of its digits is 12859560, while the sum is 61.

The square root of 7953991378 is about 89185.1522283838. The cubic root of 7953991378 is about 1996.1585746160.

The spelling of 7953991378 in words is "seven billion, nine hundred fifty-three million, nine hundred ninety-one thousand, three hundred seventy-eight".