78115147 has 4 divisors (see below), whose sum is σ = 85216536. Its totient is φ = 71013760.

The previous prime is 78115129. The next prime is 78115151. The reversal of 78115147 is 74151187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78115147 - 2⁷ = 78115019 is a prime.

It is a super-2 number, since 2×78115147² = 12203952381663218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78115157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550678 + ... + 3550699.

It is an arithmetic number, because the mean of its divisors is an integer number (21304134).

Almost surely, 2^78115147 is an apocalyptic number.

78115147 is a deficient number, since it is larger than the sum of its proper divisors (7101389).

78115147 is a wasteful number, since it uses less digits than its factorization.

78115147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7101388.

The product of its digits is 7840, while the sum is 34.

The square root of 78115147 is about 8838.2773774079. The cubic root of 78115147 is about 427.4760142944.

The spelling of 78115147 in words is "seventy-eight million, one hundred fifteen thousand, one hundred forty-seven".