78812047 has 2 divisors, whose sum is σ = 78812048. Its totient is φ = 78812046.

The previous prime is 78812039. The next prime is 78812131. The reversal of 78812047 is 74021887.

It is a weak prime.

It is an emirp because it is prime and its reverse (74021887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78812047 - 2³ = 78812039 is a prime.

It is a super-2 number, since 2×78812047² = 12422677504660418, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78811997 and 78812015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78812647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39406023 + 39406024.

It is an arithmetic number, because the mean of its divisors is an integer number (39406024).

Almost surely, 2^78812047 is an apocalyptic number.

78812047 is a deficient number, since it is larger than the sum of its proper divisors (1).

78812047 is an equidigital number, since it uses as much as digits as its factorization.

78812047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 78812047 is about 8877.6149387096. The cubic root of 78812047 is about 428.7434871102.

The spelling of 78812047 in words is "seventy-eight million, eight hundred twelve thousand, forty-seven".