78029947 has 2 divisors, whose sum is σ = 78029948. Its totient is φ = 78029946.

The previous prime is 78029911. The next prime is 78029957. The reversal of 78029947 is 74992087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78029947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78029897 and 78029906.

It is not a weakly prime, because it can be changed into another prime (78029957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39014973 + 39014974.

It is an arithmetic number, because the mean of its divisors is an integer number (39014974).

Almost surely, 2^78029947 is an apocalyptic number.

78029947 is a deficient number, since it is larger than the sum of its proper divisors (1).

78029947 is an equidigital number, since it uses as much as digits as its factorization.

78029947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 78029947 is about 8833.4561186435. The cubic root of 78029947 is about 427.3205420748.

The spelling of 78029947 in words is "seventy-eight million, twenty-nine thousand, nine hundred forty-seven".