78493799782 has 4 divisors (see below), whose sum is σ = 117740699676. Its totient is φ = 39246899890.

The previous prime is 78493799771. The next prime is 78493799819. The reversal of 78493799782 is 28799739487.

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

It is a super-2 number, since 2×78493799782² (a number of 23 digits) contains 22 as substring.

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, 19623449944 + ... + 19623449947.

It is an arithmetic number, because the mean of its divisors is an integer number (29435174919).

Almost surely, 2^78493799782 is an apocalyptic number.

78493799782 is a deficient number, since it is larger than the sum of its proper divisors (39246899894).

78493799782 is a wasteful number, since it uses less digits than its factorization.

78493799782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39246899893.

The product of its digits is 384072192, while the sum is 73.

The spelling of 78493799782 in words is "seventy-eight billion, four hundred ninety-three million, seven hundred ninety-nine thousand, seven hundred eighty-two".