78747794 has 4 divisors (see below), whose sum is σ = 118121694. Its totient is φ = 39373896.

The previous prime is 78747763. The next prime is 78747853. The reversal of 78747794 is 49774787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49774787 = 331 ⋅150377.

It can be written as a sum of positive squares in only one way, i.e., 71656225 + 7091569 = 8465^2 + 2663^2 .

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, 19686947 + ... + 19686950.

Almost surely, 2^78747794 is an apocalyptic number.

78747794 is a deficient number, since it is larger than the sum of its proper divisors (39373900).

78747794 is a wasteful number, since it uses less digits than its factorization.

78747794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39373899.

The product of its digits is 2765952, while the sum is 53.

The square root of 78747794 is about 8873.9953797599. The cubic root of 78747794 is about 428.6269417085.

The spelling of 78747794 in words is "seventy-eight million, seven hundred forty-seven thousand, seven hundred ninety-four".