7978788792 has 192 divisors, whose sum is σ = 24830172000. Its totient is φ = 2370041856.

The previous prime is 7978788767. The next prime is 7978788869. The reversal of 7978788792 is 2978878797.

It is a super-2 number, since 2×7978788792² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 7978788792.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1054848 + ... + 1062384.

Almost surely, 2^7978788792 is an apocalyptic number.

7978788792 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7978788792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12415086000).

7978788792 is an abundant number, since it is smaller than the sum of its proper divisors (16851383208).

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

7978788792 is a wasteful number, since it uses less digits than its factorization.

7978788792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7584 counting only the distinct ones).

The product of its digits is 199148544, while the sum is 72.

The square root of 7978788792 is about 89324.0661412141. The cubic root of 7978788792 is about 1998.2308348221.

The spelling of 7978788792 in words is "seven billion, nine hundred seventy-eight million, seven hundred eighty-eight thousand, seven hundred ninety-two".