78872747 has 2 divisors, whose sum is σ = 78872748. Its totient is φ = 78872746.

The previous prime is 78872723. The next prime is 78872749. The reversal of 78872747 is 74727887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78872747 - 2¹⁸ = 78610603 is a prime.

Together with 78872749, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78872695 and 78872704.

It is not a weakly prime, because it can be changed into another prime (78872749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39436373 + 39436374.

It is an arithmetic number, because the mean of its divisors is an integer number (39436374).

Almost surely, 2^78872747 is an apocalyptic number.

78872747 is a deficient number, since it is larger than the sum of its proper divisors (1).

78872747 is an equidigital number, since it uses as much as digits as its factorization.

78872747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1229312, while the sum is 50.

The square root of 78872747 is about 8881.0329917189. The cubic root of 78872747 is about 428.8535297251.

The spelling of 78872747 in words is "seventy-eight million, eight hundred seventy-two thousand, seven hundred forty-seven".