78228855 has 16 divisors (see below), whose sum is σ = 139073760. Its totient is φ = 41721984.

The previous prime is 78228853. The next prime is 78228859. The reversal of 78228855 is 55882287.

It is not a de Polignac number, because 78228855 - 2¹ = 78228853 is a prime.

It is a super-2 number, since 2×78228855² = 12239507509222050, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 78228855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78228853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289602 + ... + 289871.

It is an arithmetic number, because the mean of its divisors is an integer number (8692110).

Almost surely, 2^78228855 is an apocalyptic number.

78228855 is a deficient number, since it is larger than the sum of its proper divisors (60844905).

78228855 is a wasteful number, since it uses less digits than its factorization.

78228855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579487 (or 579481 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 78228855 is about 8844.7077396599. The cubic root of 78228855 is about 427.6833316478.

The spelling of 78228855 in words is "seventy-eight million, two hundred twenty-eight thousand, eight hundred fifty-five".