78742207 has 2 divisors, whose sum is σ = 78742208. Its totient is φ = 78742206.

The previous prime is 78742199. The next prime is 78742211. The reversal of 78742207 is 70224787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78742207 - 2³ = 78742199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78742267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39371103 + 39371104.

It is an arithmetic number, because the mean of its divisors is an integer number (39371104).

Almost surely, 2^78742207 is an apocalyptic number.

78742207 is a deficient number, since it is larger than the sum of its proper divisors (1).

78742207 is an equidigital number, since it uses as much as digits as its factorization.

78742207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43904, while the sum is 37.

The square root of 78742207 is about 8873.6805779789. The cubic root of 78742207 is about 428.6168047246.

The spelling of 78742207 in words is "seventy-eight million, seven hundred forty-two thousand, two hundred seven".