78475855 has 4 divisors (see below), whose sum is σ = 94171032. Its totient is φ = 62780680.

The previous prime is 78475847. The next prime is 78475867. The reversal of 78475855 is 55857487.

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

It is not a de Polignac number, because 78475855 - 2³ = 78475847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78475799 and 78475808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7847581 + ... + 7847590.

It is an arithmetic number, because the mean of its divisors is an integer number (23542758).

Almost surely, 2^78475855 is an apocalyptic number.

78475855 is a deficient number, since it is larger than the sum of its proper divisors (15695177).

78475855 is a wasteful number, since it uses less digits than its factorization.

78475855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15695176.

The product of its digits is 1568000, while the sum is 49.

The square root of 78475855 is about 8858.6598873645. The cubic root of 78475855 is about 428.1329815764.

The spelling of 78475855 in words is "seventy-eight million, four hundred seventy-five thousand, eight hundred fifty-five".