7878684401 has 16 divisors (see below), whose sum is σ = 9209955840. Its totient is φ = 6599292480.

The previous prime is 7878684389. The next prime is 7878684403. The reversal of 7878684401 is 1044868787.

It is a cyclic number.

It is not a de Polignac number, because 7878684401 - 2²² = 7874490097 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7878684403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199355 + ... + 235583.

It is an arithmetic number, because the mean of its divisors is an integer number (575622240).

Almost surely, 2^7878684401 is an apocalyptic number.

It is an amenable number.

7878684401 is a deficient number, since it is larger than the sum of its proper divisors (1331271439).

7878684401 is a wasteful number, since it uses less digits than its factorization.

7878684401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36944.

The product of its (nonzero) digits is 2408448, while the sum is 53.

The square root of 7878684401 is about 88761.9535668295. The cubic root of 7878684401 is about 1989.8388294848.

The spelling of 7878684401 in words is "seven billion, eight hundred seventy-eight million, six hundred eighty-four thousand, four hundred one".