7878376642 has 16 divisors (see below), whose sum is σ = 12230664192. Its totient is φ = 3802152960.

The previous prime is 7878376633. The next prime is 7878376643. The reversal of 7878376642 is 2466738787.

It is a happy number.

It is a super-2 number, since 2×7878376642² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7878376643) 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, 142143 + ... + 189634.

It is an arithmetic number, because the mean of its divisors is an integer number (764416512).

Almost surely, 2^7878376642 is an apocalyptic number.

7878376642 is a deficient number, since it is larger than the sum of its proper divisors (4352287550).

7878376642 is a wasteful number, since it uses less digits than its factorization.

7878376642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332193.

The product of its digits is 18966528, while the sum is 58.

The square root of 7878376642 is about 88760.2199298762. The cubic root of 7878376642 is about 1989.8129199652.

The spelling of 7878376642 in words is "seven billion, eight hundred seventy-eight million, three hundred seventy-six thousand, six hundred forty-two".