78720866974 has 4 divisors (see below), whose sum is σ = 118081300464. Its totient is φ = 39360433486.

The previous prime is 78720866969. The next prime is 78720867007. The reversal of 78720866974 is 47966802787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47966802787 = 12601 ⋅3806587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19680216742 + ... + 19680216745.

It is an arithmetic number, because the mean of its divisors is an integer number (29520325116).

Almost surely, 2^78720866974 is an apocalyptic number.

78720866974 is a deficient number, since it is larger than the sum of its proper divisors (39360433490).

78720866974 is a wasteful number, since it uses less digits than its factorization.

78720866974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39360433489.

The product of its (nonzero) digits is 56899584, while the sum is 64.

The spelling of 78720866974 in words is "seventy-eight billion, seven hundred twenty million, eight hundred sixty-six thousand, nine hundred seventy-four".