7878340872 has 48 divisors (see below), whose sum is σ = 22592304540. Its totient is φ = 2471635968.

The previous prime is 7878340793. The next prime is 7878340901. The reversal of 7878340872 is 2780438787.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7168331556 + 710009316 = 84666^2 + 26646^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3217053 + ... + 3219500.

Almost surely, 2^7878340872 is an apocalyptic number.

7878340872 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

7878340872 is an abundant number, since it is smaller than the sum of its proper divisors (14713963668).

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

7878340872 is a wasteful number, since it uses less digits than its factorization.

7878340872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6436582 (or 6436575 counting only the distinct ones).

The product of its (nonzero) digits is 4214784, while the sum is 54.

The square root of 7878340872 is about 88760.0184317241. The cubic root of 7878340872 is about 1989.8099085278.

The spelling of 7878340872 in words is "seven billion, eight hundred seventy-eight million, three hundred forty thousand, eight hundred seventy-two".