78278055 has 8 divisors (see below), whose sum is σ = 125244912. Its totient is φ = 41748288.

The previous prime is 78278033. The next prime is 78278071. The reversal of 78278055 is 55087287.

It is a happy number.

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

It is not a de Polignac number, because 78278055 - 2⁸ = 78277799 is a prime.

It is a super-2 number, since 2×78278055² = 12254907789166050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78277998 and 78278016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2609254 + ... + 2609283.

It is an arithmetic number, because the mean of its divisors is an integer number (15655614).

Almost surely, 2^78278055 is an apocalyptic number.

78278055 is a deficient number, since it is larger than the sum of its proper divisors (46966857).

78278055 is a wasteful number, since it uses less digits than its factorization.

78278055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218545.

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 78278055 is about 8847.4886267234. The cubic root of 78278055 is about 427.7729729538.

The spelling of 78278055 in words is "seventy-eight million, two hundred seventy-eight thousand, fifty-five".