78438375 has 80 divisors (see below), whose sum is σ = 149799936. Its totient is φ = 40824000.

The previous prime is 78438343. The next prime is 78438377. The reversal of 78438375 is 57383487.

It is not a de Polignac number, because 78438375 - 2⁵ = 78438343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (564480) is a multiple of the sum of its prime divisors (196).

It is a self number, because there is not a number n which added to its sum of digits gives 78438375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78438377) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 617562 + ... + 617688.

Almost surely, 2^78438375 is an apocalyptic number.

78438375 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78438375 is a deficient number, since it is larger than the sum of its proper divisors (71361561).

78438375 is a wasteful number, since it uses less digits than its factorization.

78438375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 196 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 78438375 is about 8856.5441905971. The cubic root of 78438375 is about 428.0648120763.

The spelling of 78438375 in words is "seventy-eight million, four hundred thirty-eight thousand, three hundred seventy-five".