7978373881 has 8 divisors (see below), whose sum is σ = 8028288000. Its totient is φ = 7928544960.

The previous prime is 7978373861. The next prime is 7978373903. The reversal of 7978373881 is 1883738797.

7978373881 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7978373881 - 2⁵ = 7978373849 is a prime.

It is a super-2 number, since 2×7978373881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7978373861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172020 + ... + 213418.

It is an arithmetic number, because the mean of its divisors is an integer number (1003536000).

Almost surely, 2^7978373881 is an apocalyptic number.

It is an amenable number.

7978373881 is a deficient number, since it is larger than the sum of its proper divisors (49914119).

7978373881 is a wasteful number, since it uses less digits than its factorization.

7978373881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42599.

The product of its digits is 14224896, while the sum is 61.

The square root of 7978373881 is about 89321.7436070300. The cubic root of 7978373881 is about 1998.1961970532.

It can be divided in two parts, 79783 and 73881, that added together give a square (153664 = 392²).

The spelling of 7978373881 in words is "seven billion, nine hundred seventy-eight million, three hundred seventy-three thousand, eight hundred eighty-one".