78081155 has 4 divisors (see below), whose sum is σ = 93697392. Its totient is φ = 62464920.

The previous prime is 78081149. The next prime is 78081161. The reversal of 78081155 is 55118087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55118087 = 139 ⋅396533.

It is an interprime number because it is at equal distance from previous prime (78081149) and next prime (78081161).

It is not a de Polignac number, because 78081155 - 2⁴ = 78081139 is a prime.

It is a super-2 number, since 2×78081155² = 12193333532268050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7808111 + ... + 7808120.

It is an arithmetic number, because the mean of its divisors is an integer number (23424348).

Almost surely, 2^78081155 is an apocalyptic number.

78081155 is a deficient number, since it is larger than the sum of its proper divisors (15616237).

78081155 is a wasteful number, since it uses less digits than its factorization.

78081155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15616236.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 78081155 is about 8836.3541689998. The cubic root of 78081155 is about 427.4139995489.

The spelling of 78081155 in words is "seventy-eight million, eighty-one thousand, one hundred fifty-five".