78070247 has 2 divisors, whose sum is σ = 78070248. Its totient is φ = 78070246.

The previous prime is 78070217. The next prime is 78070261. The reversal of 78070247 is 74207087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78070247 - 2²² = 73875943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78070207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39035123 + 39035124.

It is an arithmetic number, because the mean of its divisors is an integer number (39035124).

Almost surely, 2^78070247 is an apocalyptic number.

78070247 is a deficient number, since it is larger than the sum of its proper divisors (1).

78070247 is an equidigital number, since it uses as much as digits as its factorization.

78070247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 78070247 is about 8835.7369245581. The cubic root of 78070247 is about 427.3940952624.

The spelling of 78070247 in words is "seventy-eight million, seventy thousand, two hundred forty-seven".