78345263 has 4 divisors (see below), whose sum is σ = 78416520. Its totient is φ = 78274008.

The previous prime is 78345247. The next prime is 78345271. The reversal of 78345263 is 36254387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78345263 - 2⁴ = 78345247 is a prime.

It is a super-2 number, since 2×78345263² = 12275960469078338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78345203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33953 + ... + 36186.

It is an arithmetic number, because the mean of its divisors is an integer number (19604130).

Almost surely, 2^78345263 is an apocalyptic number.

78345263 is a deficient number, since it is larger than the sum of its proper divisors (71257).

78345263 is a wasteful number, since it uses less digits than its factorization.

78345263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71256.

The product of its digits is 120960, while the sum is 38.

The square root of 78345263 is about 8851.2859517699. The cubic root of 78345263 is about 427.8953637562.

The spelling of 78345263 in words is "seventy-eight million, three hundred forty-five thousand, two hundred sixty-three".