78390353 has 2 divisors, whose sum is σ = 78390354. Its totient is φ = 78390352.

The previous prime is 78390343. The next prime is 78390373. The reversal of 78390353 is 35309387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47997184 + 30393169 = 6928^2 + 5513^2 .

It is a cyclic number.

It is not a de Polignac number, because 78390353 - 2⁴ = 78390337 is a prime.

It is a super-2 number, since 2×78390353² = 12290094886929218, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78390343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39195176 + 39195177.

It is an arithmetic number, because the mean of its divisors is an integer number (39195177).

Almost surely, 2^78390353 is an apocalyptic number.

It is an amenable number.

78390353 is a deficient number, since it is larger than the sum of its proper divisors (1).

78390353 is an equidigital number, since it uses as much as digits as its factorization.

78390353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 78390353 is about 8853.8326729163. The cubic root of 78390353 is about 427.9774367964.

The spelling of 78390353 in words is "seventy-eight million, three hundred ninety thousand, three hundred fifty-three".