78939694 has 4 divisors (see below), whose sum is σ = 118409544. Its totient is φ = 39469846.

The previous prime is 78939689. The next prime is 78939697. The reversal of 78939694 is 49693987.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78939697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19734922 + ... + 19734925.

It is an arithmetic number, because the mean of its divisors is an integer number (29602386).

Almost surely, 2^78939694 is an apocalyptic number.

78939694 is a deficient number, since it is larger than the sum of its proper divisors (39469850).

78939694 is a wasteful number, since it uses less digits than its factorization.

78939694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39469849.

The product of its digits is 2939328, while the sum is 55.

The square root of 78939694 is about 8884.8012920943. The cubic root of 78939694 is about 428.9748320298.

The spelling of 78939694 in words is "seventy-eight million, nine hundred thirty-nine thousand, six hundred ninety-four".