78705771 has 32 divisors (see below), whose sum is σ = 115349760. Its totient is φ = 47558016.

The previous prime is 78705761. The next prime is 78705779. The reversal of 78705771 is 17750787.

It is not a de Polignac number, because 78705771 - 2⁶ = 78705707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78705779) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141025 + ... + 141581.

It is an arithmetic number, because the mean of its divisors is an integer number (3604680).

Almost surely, 2^78705771 is an apocalyptic number.

78705771 is a deficient number, since it is larger than the sum of its proper divisors (36643989).

78705771 is a wasteful number, since it uses less digits than its factorization.

78705771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683.

The product of its (nonzero) digits is 96040, while the sum is 42.

The square root of 78705771 is about 8871.6273028120. The cubic root of 78705771 is about 428.5506839324.

The spelling of 78705771 in words is "seventy-eight million, seven hundred five thousand, seven hundred seventy-one".