78110971 has 4 divisors (see below), whose sum is σ = 82705752. Its totient is φ = 73516192.

The previous prime is 78110951. The next prime is 78110983. The reversal of 78110971 is 17901187.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78110971 is a prime.

It is a super-2 number, since 2×78110971² = 12202647581125682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78110951) 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, 2297365 + ... + 2297398.

It is an arithmetic number, because the mean of its divisors is an integer number (20676438).

Almost surely, 2^78110971 is an apocalyptic number.

78110971 is a deficient number, since it is larger than the sum of its proper divisors (4594781).

78110971 is a wasteful number, since it uses less digits than its factorization.

78110971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594780.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 78110971 is about 8838.0411291191. The cubic root of 78110971 is about 427.4683966013.

The spelling of 78110971 in words is "seventy-eight million, one hundred ten thousand, nine hundred seventy-one".