78286884838 has 4 divisors (see below), whose sum is σ = 117430327260. Its totient is φ = 39143442418.

The previous prime is 78286884799. The next prime is 78286884889. The reversal of 78286884838 is 83848868287.

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

It is a super-2 number, since 2×78286884838² (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, 19571721208 + ... + 19571721211.

It is an arithmetic number, because the mean of its divisors is an integer number (29357581815).

Almost surely, 2^78286884838 is an apocalyptic number.

78286884838 is a deficient number, since it is larger than the sum of its proper divisors (39143442422).

78286884838 is a wasteful number, since it uses less digits than its factorization.

78286884838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39143442421.

The product of its digits is 264241152, while the sum is 70.

The spelling of 78286884838 in words is "seventy-eight billion, two hundred eighty-six million, eight hundred eighty-four thousand, eight hundred thirty-eight".