83621018 has 16 divisors (see below), whose sum is σ = 136601640. Its totient is φ = 38159616.

The previous prime is 83620993. The next prime is 83621029. The reversal of 83621018 is 81012638.

It can be written as a sum of positive squares in 4 ways, for example, as 48539089 + 35081929 = 6967^2 + 5923^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15755 + ... + 20382.

Almost surely, 2^83621018 is an apocalyptic number.

83621018 is a deficient number, since it is larger than the sum of its proper divisors (52980622).

83621018 is a wasteful number, since it uses less digits than its factorization.

83621018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36241.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 83621018 is about 9144.4528540531. The cubic root of 83621018 is about 437.2922864871.

The spelling of 83621018 in words is "eighty-three million, six hundred twenty-one thousand, eighteen".