7878721014 has 72 divisors (see below), whose sum is σ = 17958587880. Its totient is φ = 2560361472.

The previous prime is 7878720973. The next prime is 7878721027. The reversal of 7878721014 is 4101278787.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30656374 + ... + 30656630.

Almost surely, 2^7878721014 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7878721014, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8979293940).

7878721014 is an abundant number, since it is smaller than the sum of its proper divisors (10079866866).

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

7878721014 is an equidigital number, since it uses as much as digits as its factorization.

7878721014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 7878721014 is about 88762.1598092340. The cubic root of 7878721014 is about 1989.8419118038.

The spelling of 7878721014 in words is "seven billion, eight hundred seventy-eight million, seven hundred twenty-one thousand, fourteen".