7878069643 has 4 divisors (see below), whose sum is σ = 7995652840. Its totient is φ = 7760486448.

The previous prime is 7878069631. The next prime is 7878069673. The reversal of 7878069643 is 3469608787.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3469608787 = 12763 ⋅271849.

It is a cyclic number.

It is not a de Polignac number, because 7878069643 - 2⁵ = 7878069611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7878069613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58791498 + ... + 58791631.

It is an arithmetic number, because the mean of its divisors is an integer number (1998913210).

Almost surely, 2^7878069643 is an apocalyptic number.

7878069643 is a deficient number, since it is larger than the sum of its proper divisors (117583197).

7878069643 is a wasteful number, since it uses less digits than its factorization.

7878069643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117583196.

The product of its (nonzero) digits is 12192768, while the sum is 58.

The square root of 7878069643 is about 88758.4905403421. The cubic root of 7878069643 is about 1989.7870737561.

It can be divided in two parts, 787806 and 9643, that added together give a square (797449 = 893²).

The spelling of 7878069643 in words is "seven billion, eight hundred seventy-eight million, sixty-nine thousand, six hundred forty-three".