78820794502 has 4 divisors (see below), whose sum is σ = 118231191756. Its totient is φ = 39410397250.

The previous prime is 78820794487. The next prime is 78820794539. The reversal of 78820794502 is 20549702887.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 78820794502.

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, 19705198624 + ... + 19705198627.

It is an arithmetic number, because the mean of its divisors is an integer number (29557797939).

Almost surely, 2^78820794502 is an apocalyptic number.

78820794502 is a deficient number, since it is larger than the sum of its proper divisors (39410397254).

78820794502 is a wasteful number, since it uses less digits than its factorization.

78820794502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39410397253.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 78820794502 in words is "seventy-eight billion, eight hundred twenty million, seven hundred ninety-four thousand, five hundred two".