78705794 has 4 divisors (see below), whose sum is σ = 118058694. Its totient is φ = 39352896.

The previous prime is 78705779. The next prime is 78705811. The reversal of 78705794 is 49750787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49750787 = 131 ⋅379777.

It can be written as a sum of positive squares in only one way, i.e., 57957769 + 20748025 = 7613^2 + 4555^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19676447 + ... + 19676450.

Almost surely, 2^78705794 is an apocalyptic number.

78705794 is a deficient number, since it is larger than the sum of its proper divisors (39352900).

78705794 is a wasteful number, since it uses less digits than its factorization.

78705794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39352899.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 78705794 is about 8871.6285990792. The cubic root of 78705794 is about 428.5507256772.

The spelling of 78705794 in words is "seventy-eight million, seven hundred five thousand, seven hundred ninety-four".