78628855 has 8 divisors (see below), whose sum is σ = 95763312. Its totient is φ = 61963968.

The previous prime is 78628853. The next prime is 78628867. The reversal of 78628855 is 55882687.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78628855 - 2¹ = 78628853 is a prime.

It is a super-2 number, since 2×78628855² = 12364993677222050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78628799 and 78628808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78628853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117022 + ... + 117691.

It is an arithmetic number, because the mean of its divisors is an integer number (11970414).

Almost surely, 2^78628855 is an apocalyptic number.

78628855 is a deficient number, since it is larger than the sum of its proper divisors (17134457).

78628855 is a wasteful number, since it uses less digits than its factorization.

78628855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234785.

The product of its digits is 1075200, while the sum is 49.

The square root of 78628855 is about 8867.2913000532. The cubic root of 78628855 is about 428.4110366214.

The spelling of 78628855 in words is "seventy-eight million, six hundred twenty-eight thousand, eight hundred fifty-five".