78138327 has 4 divisors (see below), whose sum is σ = 104184440. Its totient is φ = 52092216.

The previous prime is 78138323. The next prime is 78138329. The reversal of 78138327 is 72383187.

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

It is not a de Polignac number, because 78138327 - 2² = 78138323 is a prime.

It is a super-2 number, since 2×78138327² = 12211196292717858, 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 (78138323) 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, 13023052 + ... + 13023057.

It is an arithmetic number, because the mean of its divisors is an integer number (26046110).

Almost surely, 2^78138327 is an apocalyptic number.

78138327 is a deficient number, since it is larger than the sum of its proper divisors (26046113).

78138327 is a wasteful number, since it uses less digits than its factorization.

78138327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26046112.

The product of its digits is 56448, while the sum is 39.

The square root of 78138327 is about 8839.5886216498. The cubic root of 78138327 is about 427.5182933932.

The spelling of 78138327 in words is "seventy-eight million, one hundred thirty-eight thousand, three hundred twenty-seven".