78879547 has 2 divisors, whose sum is σ = 78879548. Its totient is φ = 78879546.

The previous prime is 78879539. The next prime is 78879551. The reversal of 78879547 is 74597887.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78879547 - 2³ = 78879539 is a prime.

It is not a weakly prime, because it can be changed into another prime (78879517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39439773 + 39439774.

It is an arithmetic number, because the mean of its divisors is an integer number (39439774).

Almost surely, 2^78879547 is an apocalyptic number.

78879547 is a deficient number, since it is larger than the sum of its proper divisors (1).

78879547 is an equidigital number, since it uses as much as digits as its factorization.

78879547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3951360, while the sum is 55.

The square root of 78879547 is about 8881.4158218158. The cubic root of 78879547 is about 428.8658538815.

The spelling of 78879547 in words is "seventy-eight million, eight hundred seventy-nine thousand, five hundred forty-seven".