83720686 has 16 divisors (see below), whose sum is σ = 144654336. Its totient is φ = 35597016.

The previous prime is 83720653. The next prime is 83720687. The reversal of 83720686 is 68602738.

It is a happy number.

It is a super-3 number, since 3×83720686³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83720687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21766 + ... + 25321.

It is an arithmetic number, because the mean of its divisors is an integer number (9040896).

Almost surely, 2^83720686 is an apocalyptic number.

83720686 is a deficient number, since it is larger than the sum of its proper divisors (60933650).

83720686 is a wasteful number, since it uses less digits than its factorization.

83720686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47223.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 83720686 is about 9149.9008737800. The cubic root of 83720686 is about 437.4659539220.

The spelling of 83720686 in words is "eighty-three million, seven hundred twenty thousand, six hundred eighty-six".