78505319 has 2 divisors, whose sum is σ = 78505320. Its totient is φ = 78505318.

The previous prime is 78505313. The next prime is 78505327. The reversal of 78505319 is 91350587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78505319 - 2²⁴ = 61728103 is a prime.

It is a super-2 number, since 2×78505319² = 12326170222583522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78505313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39252659 + 39252660.

It is an arithmetic number, because the mean of its divisors is an integer number (39252660).

Almost surely, 2^78505319 is an apocalyptic number.

78505319 is a deficient number, since it is larger than the sum of its proper divisors (1).

78505319 is an equidigital number, since it uses as much as digits as its factorization.

78505319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 78505319 is about 8860.3227367856. The cubic root of 78505319 is about 428.1865561516.

The spelling of 78505319 in words is "seventy-eight million, five hundred five thousand, three hundred nineteen".