80686742 has 4 divisors (see below), whose sum is σ = 121030116. Its totient is φ = 40343370.

The previous prime is 80686721. The next prime is 80686757. The reversal of 80686742 is 24768608.

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 80686742.

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, 20171684 + ... + 20171687.

It is an arithmetic number, because the mean of its divisors is an integer number (30257529).

Almost surely, 2^80686742 is an apocalyptic number.

80686742 is a deficient number, since it is larger than the sum of its proper divisors (40343374).

80686742 is a wasteful number, since it uses less digits than its factorization.

80686742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40343373.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 80686742 is about 8982.5799189320. The cubic root of 80686742 is about 432.1163773966.

The spelling of 80686742 in words is "eighty million, six hundred eighty-six thousand, seven hundred forty-two".