7904378447 has 4 divisors (see below), whose sum is σ = 9033575376. Its totient is φ = 6775181520.

The previous prime is 7904378437. The next prime is 7904378453. The reversal of 7904378447 is 7448734097.

7904378447 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7448734097 = 7 ⋅1064104871.

It is a cyclic number.

It is not a de Polignac number, because 7904378447 - 2¹⁰ = 7904377423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7904378437) 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, 564598454 + ... + 564598467.

It is an arithmetic number, because the mean of its divisors is an integer number (2258393844).

Almost surely, 2^7904378447 is an apocalyptic number.

7904378447 is a deficient number, since it is larger than the sum of its proper divisors (1129196929).

7904378447 is a wasteful number, since it uses less digits than its factorization.

7904378447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129196928.

The product of its (nonzero) digits is 4741632, while the sum is 53.

The square root of 7904378447 is about 88906.5714500340. The cubic root of 7904378447 is about 1991.9995765356. Note that the first 3 decimals are identical.

The spelling of 7904378447 in words is "seven billion, nine hundred four million, three hundred seventy-eight thousand, four hundred forty-seven".