78115081 has 16 divisors (see below), whose sum is σ = 87736320. Its totient is φ = 68939280.

The previous prime is 78115073. The next prime is 78115087. The reversal of 78115081 is 18051187.

It is a cyclic number.

It is not a de Polignac number, because 78115081 - 2³ = 78115073 is a prime.

It is a super-2 number, since 2×78115081² = 12203931759273122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78115087) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 71320 + ... + 72406.

It is an arithmetic number, because the mean of its divisors is an integer number (5483520).

Almost surely, 2^78115081 is an apocalyptic number.

It is an amenable number.

78115081 is a deficient number, since it is larger than the sum of its proper divisors (9621239).

78115081 is a wasteful number, since it uses less digits than its factorization.

78115081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 78115081 is about 8838.2736436478. The cubic root of 78115081 is about 427.4758939019.

The spelling of 78115081 in words is "seventy-eight million, one hundred fifteen thousand, eighty-one".