83640907 has 16 divisors (see below), whose sum is σ = 101053440. Its totient is φ = 67627008.

The previous prime is 83640847. The next prime is 83640923. The reversal of 83640907 is 70904638.

It is a cyclic number.

It is not a de Polignac number, because 83640907 - 2¹¹ = 83638859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83640707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32958 + ... + 35404.

It is an arithmetic number, because the mean of its divisors is an integer number (6315840).

Almost surely, 2^83640907 is an apocalyptic number.

83640907 is a deficient number, since it is larger than the sum of its proper divisors (17412533).

83640907 is a wasteful number, since it uses less digits than its factorization.

83640907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 83640907 is about 9145.5402792837. The cubic root of 83640907 is about 437.3269532772.

The spelling of 83640907 in words is "eighty-three million, six hundred forty thousand, nine hundred seven".