78939771 has 8 divisors (see below), whose sum is σ = 106082304. Its totient is φ = 52211880.

The previous prime is 78939761. The next prime is 78939779. The reversal of 78939771 is 17793987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78939771 - 2⁷ = 78939643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78939779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103215 + ... + 103976.

It is an arithmetic number, because the mean of its divisors is an integer number (13260288).

Almost surely, 2^78939771 is an apocalyptic number.

78939771 is a deficient number, since it is larger than the sum of its proper divisors (27142533).

78939771 is a wasteful number, since it uses less digits than its factorization.

78939771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207321.

The product of its digits is 666792, while the sum is 51.

The square root of 78939771 is about 8884.8056253359. The cubic root of 78939771 is about 428.9749715078.

The spelling of 78939771 in words is "seventy-eight million, nine hundred thirty-nine thousand, seven hundred seventy-one".