78584979502 has 4 divisors (see below), whose sum is σ = 117877469256. Its totient is φ = 39292489750.

The previous prime is 78584979479. The next prime is 78584979523. The reversal of 78584979502 is 20597948587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20597948587 = 10949 ⋅1881263.

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, 19646244874 + ... + 19646244877.

It is an arithmetic number, because the mean of its divisors is an integer number (29469367314).

Almost surely, 2^78584979502 is an apocalyptic number.

78584979502 is a deficient number, since it is larger than the sum of its proper divisors (39292489754).

78584979502 is a wasteful number, since it uses less digits than its factorization.

78584979502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39292489753.

The product of its (nonzero) digits is 50803200, while the sum is 64.

The spelling of 78584979502 in words is "seventy-eight billion, five hundred eighty-four million, nine hundred seventy-nine thousand, five hundred two".