78976643 has 2 divisors, whose sum is σ = 78976644. Its totient is φ = 78976642.

The previous prime is 78976627. The next prime is 78976669. The reversal of 78976643 is 34667987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78976643 - 2⁴ = 78976627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78976591 and 78976600.

It is not a weakly prime, because it can be changed into another prime (78976613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39488321 + 39488322.

It is an arithmetic number, because the mean of its divisors is an integer number (39488322).

Almost surely, 2^78976643 is an apocalyptic number.

78976643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78976643 is an equidigital number, since it uses as much as digits as its factorization.

78976643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The square root of 78976643 is about 8886.8803862773. The cubic root of 78976643 is about 429.0417511252.

The spelling of 78976643 in words is "seventy-eight million, nine hundred seventy-six thousand, six hundred forty-three".