78804247 has 2 divisors, whose sum is σ = 78804248. Its totient is φ = 78804246.

The previous prime is 78804227. The next prime is 78804259. The reversal of 78804247 is 74240887.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78804247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78804227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39402123 + 39402124.

It is an arithmetic number, because the mean of its divisors is an integer number (39402124).

Almost surely, 2^78804247 is an apocalyptic number.

78804247 is a deficient number, since it is larger than the sum of its proper divisors (1).

78804247 is an equidigital number, since it uses as much as digits as its factorization.

78804247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 78804247 is about 8877.1756206577. The cubic root of 78804247 is about 428.7293424472.

The spelling of 78804247 in words is "seventy-eight million, eight hundred four thousand, two hundred forty-seven".