78334387 has 4 divisors (see below), whose sum is σ = 79142056. Its totient is φ = 77526720.

The previous prime is 78334363. The next prime is 78334391. The reversal of 78334387 is 78343387.

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 78334387 - 2¹¹ = 78332339 is a prime.

It is a super-2 number, since 2×78334387² = 12272552373331538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78334337) 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, 403689 + ... + 403882.

It is an arithmetic number, because the mean of its divisors is an integer number (19785514).

Almost surely, 2^78334387 is an apocalyptic number.

78334387 is a deficient number, since it is larger than the sum of its proper divisors (807669).

78334387 is an equidigital number, since it uses as much as digits as its factorization.

78334387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807668.

The product of its digits is 338688, while the sum is 43.

The square root of 78334387 is about 8850.6715564414. The cubic root of 78334387 is about 427.8755624938.

The spelling of 78334387 in words is "seventy-eight million, three hundred thirty-four thousand, three hundred eighty-seven".