83880639 has 12 divisors (see below), whose sum is σ = 121693000. Its totient is φ = 55674864.

The previous prime is 83880581. The next prime is 83880647. The reversal of 83880639 is 93608838.

83880639 is a `hidden beast` number, since 8 + 3 + 8 + 8 + 0 + 639 = 666.

It is not a de Polignac number, because 83880639 - 2⁹ = 83880127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83880594 and 83880603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83880679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18289 + ... + 22410.

Almost surely, 2^83880639 is an apocalyptic number.

83880639 is a deficient number, since it is larger than the sum of its proper divisors (37812361).

83880639 is a wasteful number, since it uses less digits than its factorization.

83880639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40934 (or 40931 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 83880639 is about 9158.6373986527. The cubic root of 83880639 is about 437.7443776476.

The spelling of 83880639 in words is "eighty-three million, eight hundred eighty thousand, six hundred thirty-nine".